java 上传文件代码，支持中文文件名和中文文件内容，可以同时提交多个参数

package com.web;
  2
  3 import java.io.DataInputStream;
  4 import java.io.File;
  5 import java.io.FileNotFoundException;
  6 import java.io.FileOutputStream;
  7 import java.io.IOException;
  8 import javax.servlet.http.HttpServletRequest;
  9 import java.io.*;
10 import java.util.HashMap;
11
12
13 public class uploadFile  {
14     public static final int MAX_SIZE = 1024 * 1024*100;
15     public static final String FILE_DIR = "d:/temp/";
16
17     private int file_Size=0;
18     private String file_Path = "";
19     private HashMap hm = new HashMap();
20
21     public String upLoad(HttpServletRequest req) {
22         String tmpString ="";
23         String result = "";
24         DataInputStream dis = null;
25         String split_Str = "";
26
27         try {
28             dis = new DataInputStream(req.getInputStream());
29             String content = req.getContentType();
30             if (content != null && content.indexOf("multipart/form-data") != -1) {
31
32                 int reqSize = req.getContentLength();
33                 byte[] data = new byte[reqSize];
34                 int bytesRead = 0;
35                 int totalBytesRead = 0;
36                 int sizeCheck = 0;
37                 while (totalBytesRead < reqSize) {
38                     // check for maximum file size violation
39                     sizeCheck = totalBytesRead + dis.available();
40                     if (sizeCheck > MAX_SIZE)
41                         result = "文件太大不能上传";
42
43                     bytesRead = dis.read(data, totalBytesRead, reqSize);
44                     totalBytesRead += bytesRead;
45                 }
46                 String dataString = null;
47                 //dataString = new String(data, "ISO-8859-1");
48                 dataString = new String(data);
49                 tmpString = new String(data);
50                 hm = parseAnotherParam(tmpString);
51               
52                 //取出字段分割符
53                 split_Str = dataString.substring(0, dataString.indexOf("\r\n"));
54                 // 分离filepath 并赋值
55                 dataString = dataString.substring(dataString.indexOf("filename=\""));
56                 String filePath = dataString.substring(0, dataString.indexOf("Content-Type:"));
57                 if (filePath==null && filePath.equals("")) return "";
58                 //System.out.println(filePath);
59                 dataString = new String(dataString.getBytes(),"ISO-8859-1");
60                 // 分离contentType 并赋值
61                 dataString = dataString.substring(dataString.indexOf("Content-Type:") + 1);
62                 dataString = dataString.substring(dataString.indexOf("\n") + 1);
63                 // 分离文件信息 获得最终想要的字节
64 //System.out.print("|"+dataString+"|");
65                 dataString = dataString.substring(2, dataString.indexOf(split_Str));
66 //System.out.println("|"+dataString+"|");
67                 dataString = dataString.substring(0, dataString.lastIndexOf("\n") - 1);
68 //System.out.print("|"+dataString+"|");
69                 if (writeFile(dataString.getBytes("ISO-8859-1"), FILE_DIR + getFileName(filePath))) {
70                     this.file_Size = dataString.getBytes("ISO-8859-1").length;
71                     this.file_Path = FILE_DIR + getFileName(filePath);
72                     result = "文件上传完毕";
73                 } else {
74                     result = "文件上传失败";
75                 }
76             } else {
77                 result = "content 必须为 multipart/form-data";
78             }
79         } catch (UnsupportedEncodingException ex4) {
80             result = "getBytes 失败 UnsupportedEncodingException错误";
81         } catch (NullPointerException e) {
82             result = "getBytes 失败 NullPointerException错误";
83         } catch (IOException ex1) {
84             result = "IOException 错误 ";
85         }
86
87         return result;
88     }
89
90     public String getFilePath(){
91         return this.file_Path;
92     }
93
94     public int getFileSize(){
95         return this.file_Size;
96     }
97
98     public boolean writeFile(byte[] data, String path) {
99         File f = null;
100         FileOutputStream fos = null;
101         try {
102             f = new File(path);
103             f.createNewFile();
104             fos = new FileOutputStream(f);
105             fos.write(data, 0, data.length);
106         } catch (FileNotFoundException e) {
107             return false;
108         } catch (IOException e) {
109             return false;
110         } finally {
111             try {
112                 fos.close();
113             } catch (IOException e) {
114                 return false;
115             }
116         }
117         return true;
118     }
119
120     public String getFileName(String arg) {
121         String path = "";
122         if (arg.indexOf("\"") > -1)
123             path = arg.substring(arg.indexOf("\"") + 1, arg.lastIndexOf("\""));
124         else
125             path = arg;
126     //System.out.println("file_path:"+arg);
127         path = path.substring(path.lastIndexOf("\\") + 1);
128         return path;
129     }
130
131
132     public HashMap parseAnotherParam(String str){
133       HashMap hm= new HashMap();
134       String key="";
135       String value="";
136       int startindex = 0;
137       int endindex = 0;
138
139       startindex = str.indexOf("Content-Dis;form-data; name=\"") + "Content-Dis;form-data; name=\"".length();
140       endindex = str.indexOf("\"\r\n\r\n");
141
142       while ( startindex >-1 && endindex > -1 ){
143         key = str.substring(startindex, endindex);
144
145         if(!str.substring(endindex , endindex + 5).equals("\"\r\n\r\n")  ){//去掉没有value的元素
146             str = str.substring(endindex);
147             startindex = str.indexOf("Content-Dis;form-data; name=\"") + "Content-Dis;form-data; name=\"".length();
148             endindex = str.indexOf("\"\r\n\r\n");
149             continue;
150         }
151         if( key.indexOf("\";") > -1){//去掉上传文件的参数以及编码
152            str = str.substring(str.indexOf("\";") + 2);
153            startindex = str.indexOf("Content-Dis;form-data; name=\"") + "Content-Dis;form-data; name=\"".length();
154            endindex = str.indexOf("\"\r\n\r\n");
155
156            continue;
157         } else
158             str = str.substring(endindex + 5);
159
160         value = str.substring(0, str.indexOf("\r\n"));
161         str = str.substring(str.indexOf("\r\n") + 2);
162         //System.out.println("key:"+key+" value:"+value);
163         hm.put(key,value);
164
165         startindex = str.indexOf("Content-Dis;form-data; name=\"") + "Content-Dis;form-data; name=\"".length();
166         endindex = str.indexOf("\"\r\n\r\n");
167
168       }
169       return hm;
170     }
171
172     public String getParameter(String param){
173         //System.out.println(hm.toString());
174       return (String)hm.get(param);
175     }
176
177
178 }