struts开发小结

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struts2

Struts JSP Java SQL CSS

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'Category_input.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<form action="admin/Category-update" method="post">
<input type="hidden" name="category.id" value="<s:property value="category.id"/>" />

name:<input name="category.name" value="<s:property value="category.name"/>" />
description:<textarea name="category.description"><s:property value="category.description"/></textarea>
<input type="submit" value="update" />
</form>
</body>
</html>

1. 建立界面原型

2. 建立Struts.xml

a) 确定namespace

b) 确定package

c) 确定Action的名称，空的方法

d) 确定Result

e) 将界面原型页面进行修改，匹配现有设置

f) 测试

g) 做好规划！！！！！

3. 建立数据库（或者实体类）

4. 建立Model层

5. 建立Service层（后面讲了Hibernate后再完善）

a) 此时可以使用JUnit进行单元测试了

Struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"

"http://struts.apache.org/dtds/struts-2.1.dtd">

<global-results>

<result name="error">/error.jsp</result>

</global-results>

<global-exception-mappings>

<exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>

</global-exception-mappings>

</package>

<result>/admin/index.html</result>

</action>

<result>/admin/{1}-{2}.jsp</result>

<result name="input">/admin/{1}-{2}.jsp</result>

<!-- <exception-mapping result="error" exception="java.sql.SQLException" />

<result name="error">/error.jsp</result> -->

</action>

<!--

<result>/admin/category_list.jsp</result>

<result name="add_input">/admin/category_add_input.jsp</result>

<result name="update_input">/admin/category_update_input.jsp</result>

</action>

-->

</package>

<default-action-ref name="Category_list" />

<result>/index.jsp</result>

</action>

</package>

</struts>

DB.java

package com.bjsxt.bbs2009.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DB {
public static Connection createConn() {
  Connection conn = null;
  try {
   Class.forName("com.mysql.jdbc.Driver");
   conn = DriverManager.getConnection("jdbc:mysql://localhost/bbs2009", "root", "bjsxt");
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return conn;
}

public static PreparedStatement prepare(Connection conn, String sql) {
  PreparedStatement ps = null;
  try {
   ps = conn.prepareStatement(sql);
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return ps;
}

public static void close(Connection conn) {

  try {
   conn.close();
   conn = null;
  } catch (SQLException e) {
   e.printStackTrace();
  }
}
public static void close(Statement stmt) {
  try {
   stmt.close();
   stmt = null;
  } catch (SQLException e) {
   e.printStackTrace();
  }
}
public static void close(ResultSet rs) {
  try {
   rs.close();
   rs = null;
  } catch (SQLException e) {
   e.printStackTrace();
  }
}
}

Catagary.java(model)

package com.bjsxt.bbs2009.model;

public class Category {
private int id;
private String name;
private String description;
public int getId() {
  return id;
}
public void setId(int id) {
  this.id = id;
}
public String getName() {
  return name;
}
public void setName(String name) {
  this.name = name;
}
public String getDescription() {
  return description;
}
public void setDescription(String description) {
  this.description = description;
}

}

CatagaryService.java

package com.bjsxt.bbs2009.service;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.bjsxt.bbs2009.model.Category;
import com.bjsxt.bbs2009.util.DB;

public class CategoryService {
public void add(Category c) {
  Connection conn = DB.createConn();
  String sql = "insert into _category values (null, ?, ?)";
  PreparedStatement ps = DB.prepare(conn, sql);
  try {
   ps.setString(1, c.getName());
   ps.setString(2, c.getDescription());
   ps.executeUpdate();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  DB.close(ps);
  DB.close(conn);
}

public List<Category> list() throws SQLException {
  Connection conn = DB.createConn();
  String sql = "select * from _category_";
  PreparedStatement ps = DB.prepare(conn, sql);
  List<Category> categories = new ArrayList<Category>();
  try {
   ResultSet rs = ps.executeQuery();
   Category c = null;
   while(rs.next()) {
    c = new Category();
    c.setId(rs.getInt("id"));
    c.setName(rs.getString("name"));
    c.setDescription(rs.getString("description"));
    categories.add(c);
   }
  } catch (SQLException e) {
   e.printStackTrace();
   throw(e);
  }
  DB.close(ps);
  DB.close(conn);
  return categories;
}

public void delete(Category c) {
  deleteById(c.getId());
}

public void deleteById(int id) {
  Connection conn = DB.createConn();
  String sql = "delete from _category where id = ?";
  PreparedStatement ps = DB.prepare(conn, sql);
  try {
   ps.setInt(1, id);
   ps.executeUpdate();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  DB.close(ps);
  DB.close(conn);
}

public void update(Category c) {
  Connection conn = DB.createConn();
  String sql = "update _category set name = ?, description = ? where id = ?";
  PreparedStatement ps = DB.prepare(conn, sql);
  try {
   ps.setString(1, c.getName());
   ps.setString(2, c.getDescription());
   ps.setInt(3, c.getId());
   ps.executeUpdate();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  DB.close(ps);
  DB.close(conn);
}

public Category loadById(int id) {
  Connection conn = DB.createConn();
  String sql = "select * from _category where id = ?";
  PreparedStatement ps = DB.prepare(conn, sql);
  Category c = null;
  try {
   ps.setInt(1, id);
   ResultSet rs = ps.executeQuery();

   if(rs.next()) {
    c = new Category();
    c.setId(rs.getInt("id"));
    c.setName(rs.getString("name"));
    c.setDescription(rs.getString("description"));
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }
  DB.close(ps);
  DB.close(conn);
  return c;
}
}

CatagaryAction.java

package com.bjsxt.bbs2009.action;

import java.util.List;

import com.bjsxt.bbs2009.model.Category;
import com.bjsxt.bbs2009.service.CategoryService;
import com.opensymphony.xwork2.ActionSupport;

public class CategoryAction extends ActionSupport {
private List<Category> categories;
private CategoryService categoryService = new CategoryService();
private Category category;
private int id;

public String list() throws Exception {
  categories = categoryService.list();
  return SUCCESS;
}

public String add() {
  categoryService.add(category);
  return SUCCESS;
}
public String update() {
  categoryService.update(category);
  return SUCCESS;
}
public String delete() {
  categoryService.deleteById(id);
  return SUCCESS;
}
public String addInput() {

  return INPUT;
}
public String updateInput() {
  this.category = this.categoryService.loadById(id);
  return INPUT;
}
public List<Category> getCategories() {
  return categories;
}
public void setCategories(List<Category> categories) {
  this.categories = categories;
}
public CategoryService getCategoryService() {
  return categoryService;
}
public void setCategoryService(CategoryService categoryService) {
  this.categoryService = categoryService;
}
public Category getCategory() {
  return category;
}
public void setCategory(Category category) {
  this.category = category;
}
public int getId() {
  return id;
}
public void setId(int id) {
  this.id = id;
}
}

Category-list.jsp

</head>

<body>
Category_list
<a href="admin/Category-addInput">添加Category</a>
<a href="admin/Category-updateInput">更新Category</a>

<hr/>
<s:iterator value="categories" var="c">
<s:property value="#c.name"/> |
<s:property value="#c.description"/> |
<a href="admin/Category-delete?id=<s:property value="#c.id"/>">删除Category</a> |
<a href="admin/Category-updateInput?id=<s:property value="#c.id"/>">更新Category</a>
<br/>
</s:iterator>
<s:debug></s:debug>
</body>
</html>

Category-add.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'Category_input.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
add ok!
</body>
</html>

Category-addInput.jsp

</head>

<body>
<form action="admin/Category-add" method="post">
name:<input name="category.name" />
description:<textarea name="category.description"></textarea>
<input type="submit" value="add" />
</form>
</body>
</html>

Category-delete.jsp

</head>

<body>
Category_delete
</body>
</html>

Category-updateInput.jsp

Category-update.jsp

</head>

<body>
update ok!
</body>
</html>

mysql.sql

create database bbs2009;

use bbs2009;

create table _category(id int primary key auto_increment, name varchar(50), descrtiption varchar(200));

struts2_BBS2009ExceptionHandling.rar (4.7 MB)
下载次数: 0

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Struts2拦截器配置 | 数据校验DataValiation

2011-03-20 21:27
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