Redmine之报表应用研究

近来将RedMine的源代码下下来进行研究，主要目的是研究它的Report功能是如何实现的

目前研究结果总结为几点：

1）Remine界面上支持PDF，CSV，HTML输出，但没有单独的报表运行中心，只有在Issue及Gant界面有报表输出功能

2）新建两个用户a和b，a用户在创建时默认语言选择“English”，b用户选择"Chinese(Simple)"，进行报表打印时发现第一个用户打印出来的PDF报表中文显示为乱码，第二个用户打印的PDF报表中文显示正常

对于以上两点，进行了代码跟踪，得出了以下结论

1）报表输出的代码写在IssuesController，关键代码如下：

respond_to do |format|
        format.html { render :template => 'issues/index.rhtml', :layout => !request.xhr? }
        format.atom { render_feed(@issues, :title => "#{@project || Setting.app_title}: #{l(:label_issue_plural)}") }
        format.csv  { send_data(issues_to_csv(@issues, @project), :type => 'text/csv; header=present', :filename => 'export.csv') }
        format.pdf  { send_data(issues_to_pdf(@issues, @project, @query), :type => 'application/pdf', :filename => 'export.pdf') }
      end

代码中很清晰看到CSV、PDF 的输出调用的是 issues_to_csv,issues_to_pdf（Gant界面的报表调用的是gant_to_pdf）

从名字可猜测Redmine中的报表打印并不通用，只是针对特定的报表进行了固定的输出处理

issue_to_pdf，issues_to_pdf，gant_to_pdf都包含在pdf.rb中，代码如下：

# encoding: utf-8
#
# Redmine - project management software
# Copyright (C) 2006-2009  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'iconv'
require 'rfpdf/fpdf'
require 'rfpdf/chinese'

module Redmine
  module Export
    module PDF
      include ActionView::Helpers::TextHelper
      include ActionView::Helpers::NumberHelper
      
      class IFPDF < FPDF
        include Redmine::I18n
        attr_accessor :footer_date
        
        def initialize(lang)
          super()
          set_language_if_valid lang
          puts "=============================Current Language #{current_language.to_s.downcase}"
          #current_language = 'zh'
          case current_language.to_s.downcase
          when 'ko'
            extend(PDF_Korean)
            AddUHCFont()
            @font_for_content = 'UHC'
            @font_for_footer = 'UHC'
          when 'ja'
            extend(PDF_Japanese)
            AddSJISFont()
            @font_for_content = 'SJIS'
            @font_for_footer = 'SJIS'
          when 'zh'
            extend(PDF_Chinese)
            AddGBFont()
            @font_for_content = 'GB'
            @font_for_footer = 'GB'
            puts "=========================AddGBFont()"
          when 'zh-tw'
            extend(PDF_Chinese)
            AddBig5Font()
            @font_for_content = 'Big5'
            @font_for_footer = 'Big5'
          else
            @font_for_content = 'Arial'
            @font_for_footer = 'Helvetica'              
          end
          SetCreator(Redmine::Info.app_name)
          SetFont(@font_for_content)
        end
        
        def SetFontStyle(style, size)
          SetFont(@font_for_content, style, size)
        end
        
        def SetTitle(txt)
          txt = begin
            utf16txt = Iconv.conv('UTF-16BE', 'UTF-8', txt)
            hextxt = "<FEFF"  # FEFF is BOM
            hextxt << utf16txt.unpack("C*").map {|x| sprintf("%02X",x) }.join
            hextxt << ">"
          rescue
            txt
          end || ''
          super(txt)
        end
    
        def textstring(s)
          # Format a text string
          if s =~ /^</  # This means the string is hex-dumped.
            return s
          else
            return '('+escape(s)+')'
          end
        end
          
        def Cell(w,h=0,txt='',border=0,ln=0,align='',fill=0,link='')
          puts ":general_pdf_encoding==================#{l(:general_pdf_encoding)}"
          @ic ||= Iconv.new(l(:general_pdf_encoding), 'UTF-8')
          # these quotation marks are not correctly rendered in the pdf
          txt = txt.gsub(/[“�]/, '"') if txt
          txt = begin
            # 0x5c char handling
            txtar = txt.split('\\')
            txtar << '' if txt[-1] == ?\\
            txtar.collect {|x| @ic.iconv(x)}.join('\\').gsub(/\\/, "\\\\\\\\")
          rescue
            txt
          end || ''
          super w,h,txt,border,ln,align,fill,link
        end
        
        def Footer
          SetFont(@font_for_footer, 'I', 8)
          SetY(-15)
          SetX(15)
          Cell(0, 5, @footer_date, 0, 0, 'L')
          SetY(-15)
          SetX(-30)
          Cell(0, 5, PageNo().to_s + '/{nb}', 0, 0, 'C')
        end
      end
      
      # Returns a PDF string of a list of issues
      def issues_to_pdf(issues, project, query)
        pdf = IFPDF.new(current_language)
        title = query.new_record? ? l(:label_issue_plural) : query.name
        title = "#{project} - #{title}" if project
        pdf.SetTitle(title)
        pdf.AliasNbPages
        pdf.footer_date = format_date(Date.today)
        pdf.AddPage("L")
        
        row_height = 6
        col_width = []
        unless query.columns.empty?
          col_width = query.columns.collect {|column| column.name == :subject ? 4.0 : 1.0 }
          ratio = 262.0 / col_width.inject(0) {|s,w| s += w}
          col_width = col_width.collect {|w| w * ratio}
        end
        
        # title
        pdf.SetFontStyle('B',11)    
        pdf.Cell(190,10, title)
        pdf.Ln
        
        # headers
        pdf.SetFontStyle('B',8)
        pdf.SetFillColor(230, 230, 230)
        pdf.Cell(15, row_height, "#", 1, 0, 'L', 1)
        query.columns.each_with_index do |column, i|
          pdf.Cell(col_width[i], row_height, column.caption, 1, 0, 'L', 1)
        end
        pdf.Ln
        
        # rows
        pdf.SetFontStyle('',8)
        pdf.SetFillColor(255, 255, 255)
        previous_group = false
        issues.each do |issue|
          if query.grouped? && (group = query.group_by_column.value(issue)) != previous_group
            pdf.SetFontStyle('B',9)
            pdf.Cell(277, row_height, 
              (group.blank? ? 'None' : group.to_s) + " (#{@issue_count_by_group[group]})",
              1, 1, 'L')
            pdf.SetFontStyle('',8)
            previous_group = group
          end
          pdf.Cell(15, row_height, issue.id.to_s, 1, 0, 'L', 1)
          query.columns.each_with_index do |column, i|
            s = if column.is_a?(QueryCustomFieldColumn)
              cv = issue.custom_values.detect {|v| v.custom_field_id == column.custom_field.id}
              show_value(cv)
            else
              value = issue.send(column.name)
              if value.is_a?(Date)
                format_date(value)
              elsif value.is_a?(Time)
                format_time(value)
              else
                value
              end
            end
            pdf.Cell(col_width[i], row_height, s.to_s, 1, 0, 'L', 1)
          end
          pdf.Ln
        end
        if issues.size == Setting.issues_export_limit.to_i
          pdf.SetFontStyle('B',10)
          pdf.Cell(0, row_height, '...')
        end
        pdf.Output
      end
      
      # Returns a PDF string of a single issue
      def issue_to_pdf(issue)
        pdf = IFPDF.new(current_language)
        pdf.SetTitle("#{issue.project} - ##{issue.tracker} #{issue.id}")
        pdf.AliasNbPages
        pdf.footer_date = format_date(Date.today)
        pdf.AddPage
        
        pdf.SetFontStyle('B',11)    
        pdf.Cell(190,10, "#{issue.project} - #{issue.tracker} # #{issue.id}: #{issue.subject}")
        pdf.Ln
        
        y0 = pdf.GetY
        
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_status) + ":","LT")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, issue.status.to_s,"RT")
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_priority) + ":","LT")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, issue.priority.to_s,"RT")        
        pdf.Ln
          
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_author) + ":","L")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, issue.author.to_s,"R")
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_category) + ":","L")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, issue.category.to_s,"R")
        pdf.Ln   
        
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_created_on) + ":","L")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, format_date(issue.created_on),"R")
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_assigned_to) + ":","L")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, issue.assigned_to.to_s,"R")
        pdf.Ln
        
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_updated_on) + ":","LB")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, format_date(issue.updated_on),"RB")
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_due_date) + ":","LB")
        pdf.SetFontStyle('',9)
        pdf.Cell(60,5, format_date(issue.due_date),"RB")
        pdf.Ln
          
        for custom_value in issue.custom_field_values
          pdf.SetFontStyle('B',9)
          pdf.Cell(35,5, custom_value.custom_field.name + ":","L")
          pdf.SetFontStyle('',9)
          pdf.MultiCell(155,5, (show_value custom_value),"R")
        end
          
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_subject) + ":","LTB")
        pdf.SetFontStyle('',9)
        pdf.Cell(155,5, issue.subject,"RTB")
        pdf.Ln    
        
        pdf.SetFontStyle('B',9)
        pdf.Cell(35,5, l(:field_description) + ":")
        pdf.SetFontStyle('',9)
        pdf.MultiCell(155,5, @issue.description,"BR")
        
        pdf.Line(pdf.GetX, y0, pdf.GetX, pdf.GetY)
        pdf.Line(pdf.GetX, pdf.GetY, 170, pdf.GetY)
        pdf.Ln
        
        if issue.changesets.any? && User.current.allowed_to?(:view_changesets, issue.project)
          pdf.SetFontStyle('B',9)
          pdf.Cell(190,5, l(:label_associated_revisions), "B")
          pdf.Ln
          for changeset in issue.changesets
            pdf.SetFontStyle('B',8)
            pdf.Cell(190,5, format_time(changeset.committed_on) + " - " + changeset.author.to_s)
            pdf.Ln
            unless changeset.comments.blank?
              pdf.SetFontStyle('',8)
              pdf.MultiCell(190,5, changeset.comments)
            end   
            pdf.Ln
          end
        end
        
        pdf.SetFontStyle('B',9)
        pdf.Cell(190,5, l(:label_history), "B")
        pdf.Ln  
        for journal in issue.journals.find(:all, :include => [:user, :details], :order => "#{Journal.table_name}.created_on ASC")
          pdf.SetFontStyle('B',8)
          pdf.Cell(190,5, format_time(journal.created_on) + " - " + journal.user.name)
          pdf.Ln
          pdf.SetFontStyle('I',8)
          for detail in journal.details
            pdf.Cell(190,5, "- " + show_detail(detail, true))
            pdf.Ln
          end
          if journal.notes?
            pdf.SetFontStyle('',8)
            pdf.MultiCell(190,5, journal.notes)
          end   
          pdf.Ln
        end
        
        if issue.attachments.any?
          pdf.SetFontStyle('B',9)
          pdf.Cell(190,5, l(:label_attachment_plural), "B")
          pdf.Ln
          for attachment in issue.attachments
            pdf.SetFontStyle('',8)
            pdf.Cell(80,5, attachment.filename)
            pdf.Cell(20,5, number_to_human_size(attachment.filesize),0,0,"R")
            pdf.Cell(25,5, format_date(attachment.created_on),0,0,"R")
            pdf.Cell(65,5, attachment.author.name,0,0,"R")
            pdf.Ln
          end
        end
        pdf.Output
      end
      
      # Returns a PDF string of a gantt chart
      def gantt_to_pdf(gantt, project)
        pdf = IFPDF.new(current_language)
        pdf.SetTitle("#{l(:label_gantt)} #{project}")
        pdf.AliasNbPages
        pdf.footer_date = format_date(Date.today)
        pdf.AddPage("L")
        pdf.SetFontStyle('B',12)
        pdf.SetX(15)
        pdf.Cell(70, 20, project.to_s)
        pdf.Ln
        pdf.SetFontStyle('B',9)
        
        subject_width = 70
        header_heigth = 5
        
        headers_heigth = header_heigth
        show_weeks = false
        show_days = false
        
        if gantt.months < 7
          show_weeks = true
          headers_heigth = 2*header_heigth
          if gantt.months < 3
            show_days = true
            headers_heigth = 3*header_heigth
          end
        end
        
        g_width = 210
        zoom = (g_width) / (gantt.date_to - gantt.date_from + 1)
        g_height = 120
        t_height = g_height + headers_heigth
        
        y_start = pdf.GetY
        
        # Months headers
        month_f = gantt.date_from
        left = subject_width
        height = header_heigth
        gantt.months.times do 
          width = ((month_f >> 1) - month_f) * zoom 
          pdf.SetY(y_start)
          pdf.SetX(left)
          pdf.Cell(width, height, "#{month_f.year}-#{month_f.month}", "LTR", 0, "C")
          left = left + width
          month_f = month_f >> 1
        end  
        
        # Weeks headers
        if show_weeks
          left = subject_width
          height = header_heigth
          if gantt.date_from.cwday == 1
            # gantt.date_from is monday
            week_f = gantt.date_from
          else
            # find next monday after gantt.date_from
            week_f = gantt.date_from + (7 - gantt.date_from.cwday + 1)
            width = (7 - gantt.date_from.cwday + 1) * zoom-1
            pdf.SetY(y_start + header_heigth)
            pdf.SetX(left)
            pdf.Cell(width + 1, height, "", "LTR")
            left = left + width+1
          end
          while week_f <= gantt.date_to
            width = (week_f + 6 <= gantt.date_to) ? 7 * zoom : (gantt.date_to - week_f + 1) * zoom
            pdf.SetY(y_start + header_heigth)
            pdf.SetX(left)
            pdf.Cell(width, height, (width >= 5 ? week_f.cweek.to_s : ""), "LTR", 0, "C")
            left = left + width
            week_f = week_f+7
          end
        end
        
        # Days headers
        if show_days
          left = subject_width
          height = header_heigth
          wday = gantt.date_from.cwday
          pdf.SetFontStyle('B',7)
          (gantt.date_to - gantt.date_from + 1).to_i.times do 
            width = zoom
            pdf.SetY(y_start + 2 * header_heigth)
            pdf.SetX(left)
            pdf.Cell(width, height, day_name(wday).first, "LTR", 0, "C")
            left = left + width
            wday = wday + 1
            wday = 1 if wday > 7
          end
        end
        
        pdf.SetY(y_start)
        pdf.SetX(15)
        pdf.Cell(subject_width+g_width-15, headers_heigth, "", 1)
        
        # Tasks
        top = headers_heigth + y_start
        pdf.SetFontStyle('B',7)
        gantt.events.each do |i|
          pdf.SetY(top)
          pdf.SetX(15)
          
          if i.is_a? Issue
            pdf.Cell(subject_width-15, 5, "#{i.tracker} #{i.id}: #{i.subject}".sub(/^(.{30}[^\s]*\s).*$/, '\1 (...)'), "LR")
          else
            pdf.Cell(subject_width-15, 5, "#{l(:label_version)}: #{i.name}", "LR")
          end
        
          pdf.SetY(top)
          pdf.SetX(subject_width)
          pdf.Cell(g_width, 5, "", "LR")
        
          pdf.SetY(top+1.5)
          
          if i.is_a? Issue
            i_start_date = (i.start_date >= gantt.date_from ? i.start_date : gantt.date_from )
            i_end_date = (i.due_before <= gantt.date_to ? i.due_before : gantt.date_to )
            
            i_done_date = i.start_date + ((i.due_before - i.start_date+1)*i.done_ratio/100).floor
            i_done_date = (i_done_date <= gantt.date_from ? gantt.date_from : i_done_date )
            i_done_date = (i_done_date >= gantt.date_to ? gantt.date_to : i_done_date )
            
            i_late_date = [i_end_date, Date.today].min if i_start_date < Date.today
            
            i_left = ((i_start_date - gantt.date_from)*zoom) 
            i_width = ((i_end_date - i_start_date + 1)*zoom)
            d_width = ((i_done_date - i_start_date)*zoom)
            l_width = ((i_late_date - i_start_date+1)*zoom) if i_late_date
            l_width ||= 0
          
            pdf.SetX(subject_width + i_left)
            pdf.SetFillColor(200,200,200)
            pdf.Cell(i_width, 2, "", 0, 0, "", 1)
          
            if l_width > 0
              pdf.SetY(top+1.5)
              pdf.SetX(subject_width + i_left)
              pdf.SetFillColor(255,100,100)
              pdf.Cell(l_width, 2, "", 0, 0, "", 1)
            end 
            if d_width > 0
              pdf.SetY(top+1.5)
              pdf.SetX(subject_width + i_left)
              pdf.SetFillColor(100,100,255)
              pdf.Cell(d_width, 2, "", 0, 0, "", 1)
            end
            
            pdf.SetY(top+1.5)
            pdf.SetX(subject_width + i_left + i_width)
            pdf.Cell(30, 2, "#{i.status} #{i.done_ratio}%")
          else
            i_left = ((i.start_date - gantt.date_from)*zoom) 
            
            pdf.SetX(subject_width + i_left)
            pdf.SetFillColor(50,200,50)
            pdf.Cell(2, 2, "", 0, 0, "", 1) 
        
            pdf.SetY(top+1.5)
            pdf.SetX(subject_width + i_left + 3)
            pdf.Cell(30, 2, "#{i.name}")
          end
          
          top = top + 5
          pdf.SetDrawColor(200, 200, 200)
          pdf.Line(15, top, subject_width+g_width, top)
          if pdf.GetY() > 180
            pdf.AddPage("L")
            top = 20
            pdf.Line(15, top, subject_width+g_width, top)
          end
          pdf.SetDrawColor(0, 0, 0)
        end
        
        pdf.Line(15, top, subject_width+g_width, top)
        pdf.Output
      end
    end
  end
end

而issues_to_csv包含在IssuesHelper中

 def issues_to_csv(issues, project = nil)
    ic = Iconv.new(l(:general_csv_encoding), 'UTF-8')    
    decimal_separator = l(:general_csv_decimal_separator)
    export = FCSV.generate(:col_sep => l(:general_csv_separator)) do |csv|
      # csv header fields
      headers = [ "#",
                  l(:field_status), 
                  l(:field_project),
                  l(:field_tracker),
                  l(:field_priority),
                  l(:field_subject),
                  l(:field_assigned_to),
                  l(:field_category),
                  l(:field_fixed_version),
                  l(:field_author),
                  l(:field_start_date),
                  l(:field_due_date),
                  l(:field_done_ratio),
                  l(:field_estimated_hours),
                  l(:field_created_on),
                  l(:field_updated_on)
                  ]
      # Export project custom fields if project is given
      # otherwise export custom fields marked as "For all projects"
      custom_fields = project.nil? ? IssueCustomField.for_all : project.all_issue_custom_fields
      custom_fields.each {|f| headers << f.name}
      # Description in the last column
      headers << l(:field_description)
      csv << headers.collect {|c| begin; ic.iconv(c.to_s); rescue; c.to_s; end }
      # csv lines
      issues.each do |issue|
        fields = [issue.id,
                  issue.status.name, 
                  issue.project.name,
                  issue.tracker.name, 
                  issue.priority.name,
                  issue.subject,
                  issue.assigned_to,
                  issue.category,
                  issue.fixed_version,
                  issue.author.name,
                  format_date(issue.start_date),
                  format_date(issue.due_date),
                  issue.done_ratio,
                  issue.estimated_hours.to_s.gsub('.', decimal_separator),
                  format_time(issue.created_on),  
                  format_time(issue.updated_on)
                  ]
        custom_fields.each {|f| fields << show_value(issue.custom_value_for(f)) }
        fields << issue.description
        csv << fields.collect {|c| begin; ic.iconv(c.to_s); rescue; c.to_s; end }
      end
    end
    export
  end

由以上的代码可以得出结论：RedMine中只有甘特图、问题界面支持报表输出，而且不是每一个地方都支持PDF与CSV两种格式的

2）为什么默认语言类型不同的用户输出相同的报表会得到不一样的结果（关于中文乱码）

要解释这个问题，重点在pdf.rb中

RedMine中对PDF的输出用的是FPDF，FPDF中支持中文输出，它内嵌了GB、Big5字体，对于中文的输出需要做两步

1、在输出PDF之前设置输出字体为 GB或Big5

2、对于中文在输出之前进行字符集转换，从UTF-8转换成支持中文的字符集（如GBK，GB2312）

那么PDF是怎么做的呢？

首先，看以下代码：

def initialize(lang)
          super()
          set_language_if_valid lang
          puts "=============================Current Language #{current_language.to_s.downcase}"
          #current_language = 'zh'
          case current_language.to_s.downcase
          when 'ko'
            extend(PDF_Korean)
            AddUHCFont()
            @font_for_content = 'UHC'
            @font_for_footer = 'UHC'
          when 'ja'
            extend(PDF_Japanese)
            AddSJISFont()
            @font_for_content = 'SJIS'
            @font_for_footer = 'SJIS'
          when 'zh'
            extend(PDF_Chinese)
            AddGBFont()
            @font_for_content = 'GB'
            @font_for_footer = 'GB'
            puts "=========================AddGBFont()"
          when 'zh-tw'
            extend(PDF_Chinese)
            AddBig5Font()
            @font_for_content = 'Big5'
            @font_for_footer = 'Big5'
          else
            @font_for_content = 'Arial'
            @font_for_footer = 'Helvetica'              
          end
          SetCreator(Redmine::Info.app_name)
          SetFont(@font_for_content)
        end

对于默认语言为“English”的用户，登陆后观察current_language的值，发现为"en"

对于默认语言为"Chinese(Simple)"的用户，登陆后观察current_language的值，发现为"zh"

那么current_language的值是怎么得到的呢？

在Redmine中有些配置文件，其中涉及到default_language的设置，默认都设置为"en"，尝试改为"zh"，发现current_language的值没有发生改变

在研究了其他的源代码发现current_language的值与数据表users中的LANGUAGE字段关联

在ApplicationController中发现以下代码：

def set_localization
    lang = nil
    if User.current.logged?
      lang = find_language(User.current.language)
    end
    if lang.nil? && request.env['HTTP_ACCEPT_LANGUAGE']
      accept_lang = parse_qvalues(request.env['HTTP_ACCEPT_LANGUAGE']).first.downcase
      if !accept_lang.blank?
        lang = find_language(accept_lang) || find_language(accept_lang.split('-').first)
      end
    end
    lang ||= Setting.default_language
    set_language_if_valid(lang)
  end

既然a用户和b用户因为默认语言不一样导致current_language不一样，那么如果在PDF.initilize中将current_language强制设置为"zh"，是否就能得到一样的结果呢？测试结果发现，即使这样设置，a用户打印的PDF报表中文仍然是乱码，不同的是，乱码与之前的不一样。

问题到底出在哪呢？

继续研究，发现PDF中的Cell方法（FPDF输出的关键方法之一）中有这么一句：

@ic ||= Iconv.new(l(:general_pdf_encoding), 'UTF-8')

原来在这里进行了字符集转换，那么a用户与b用户得到的 l(:general_pdf_encoding)是否用相同呢，测试发现，

a用户进入系统后得到的值为"ISO-8859-1"

b用户进入系统后得到的值为"gb18030"

单独FPDF输出报表进行测试，发现

在选择 GB 字体的情况下，

Iconv.conv("gb18030","UTF-8","测试")与 Iconv.conv("ISO-8859-1","UTF-8","测试")得到的结果不一样，前者是正常显示中文，后者则显示乱码

至此，以上两点疑问都得到了解释，这些就是到目前研究RedMine报表应用得到的结论