httpurlconnection模拟post提交form表单(普通文本和上传文件) (

http://blog.sina.com.cn/s/blog_8417657f0101gvpc.html

 

用HttpUrlConnection模拟post表单进行文件上传平时很少使用,比较麻烦。

 

原理是: 分析文件上传的数据格式,然后根据格式构造相应的发送给服务器的字符串。

格式如下:这里的httppost123是我自己构造的字符串,可以是其他任何的字符串

----------httppost123 (\r\n)
Content-Disposition: form-data; name="img"; filename="t.txt" (\r\n)
Content-Type: application/octet-stream (\r\n)

(\r\n)

sdfsdfsdfsdfsdf (\r\n)
----------httppost123 (\r\n)
Content-Disposition: form-data; name="text" (\r\n)

(\r\n)

text tttt (\r\n)
----------httppost123-- (\r\n)
(\r\n)

 

上面的(\r\n)表示各个数据必须以(\r\n)结尾。

 

package com.haitai.IntelligentAdapters.common;
import java.io.ByteArrayOutputStream; 
import java.io.DataInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.util.ArrayList; 
import java.util.List; 
import java.net.HttpURLConnection; 
import java.net.URL;


public class HttpMultipartRequest {

     //每个post参数之间的分隔 
    static final String BOUNDARY = "----MyFormBoundarySMFEtUYQG6r5B920";  // 定义数据分隔线  
    private String urlStr;  // 连接的地址
    private List<String[]> strParams; // 文字post项集 strParams 1:key 2:value  
    private List<String[]> fileParams; // 文件的post项集 fileParams 1:fileField, 2.fileName, 3.fileType, 4.filePath  
 
  
     
    public HttpMultipartRequest(String urlStr, List<String[]> strParams, List<String[]> fileParams) { 
        this.urlStr = urlStr; 
        this.strParams = strParams; 
        this.fileParams = fileParams; 
 
    } 
 
     
    public byte[] sendPost() throws Exception {    
        HttpURLConnection hc = null;  //http连接器
        ByteArrayOutputStream bos = null;//byte输出流,用来读取服务器返回的信息   
        InputStream is = null;//输入流,用来读取服务器返回的信息  
        byte[] res = null;//保存服务器返回的信息的byte数组
        try { 
            URL url = new URL(urlStr); 
            hc = (HttpURLConnection) url.openConnection(); 
 
            hc.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); 
            hc.setRequestProperty("Charsert", "UTF-8"); 
            // 发送POST请求必须设置如下两行 
            hc.setDoOutput(true); 
            hc.setDoInput(true); 
            hc.setUseCaches(false); 
            hc.setRequestMethod("POST"); 
 
            OutputStream dout = hc.getOutputStream(); 
            ////1.先写文字形式的post流 
            //头 
            String boundary = BOUNDARY; 
            //中 
            StringBuffer resSB = new StringBuffer("\r\n"); 
            //尾 
            String endBoundary = "\r\n--" + boundary + "--\r\n"; 
            //strParams 1:key 2:value 
            if(strParams != null){ 
                for(String[] parsm : strParams){ 
                    String key = parsm[0]; 
                    String value = parsm[1]; 
                    resSB.append("Content-Disposition: form-data; name="").append(key).append(""\r\n").append("\r\n").append(value).append("\r\n").append("--").append(boundary).append("\r\n"); 
                } 
            } 
            String boundaryMessage = resSB.toString(); 
             
            //写出流 
            dout.write( ("--"+boundary+boundaryMessage).getBytes("utf-8") ); 
             
            //2.再写文件开式的post流 
            //fileParams 1:fileField, 2.fileName, 3.fileType, 4.filePath 
            resSB = new StringBuffer(); 
            if(fileParams != null){ 
                for(int i=0, num=fileParams.size(); i<num; i++){ 
                    String[] parsm = fileParams.get(i); 
                    String fileField = parsm[0]; 
                    String fileName = parsm[1]; 
                    String fileType = parsm[2]; 
                    String filePath = parsm[3]; 
                     
                    resSB.append("Content-Disposition: form-data; name="").append(fileField).append(""; filename="").append( 
                            fileName).append(""\r\n").append("Content-Type: ").append(fileType).append("\r\n\r\n"); 
                     
                    dout.write( resSB.toString().getBytes("utf-8") ); 
                     
                    //开始写文件 
                    File file = new File(filePath); 
                    DataInputStream in = new DataInputStream(new FileInputStream(file)); 
                    int bytes = 0; 
                    byte[] bufferOut = new byte[1024 * 5]; 
                    while ((bytes = in.read(bufferOut)) != -1) { 
                        dout.write(bufferOut, 0, bytes); 
                    } 
                     
                    if(i<num-1){ 
                        dout.write( endBoundary.getBytes("utf-8") ); 
                    } 
                     
                    in.close(); 
                } 
                 
            } 
             
            //3.最后写结尾 
            dout.write( endBoundary.getBytes("utf-8") );    
            dout.close();  

            int ch;  
            is = hc.getInputStream();    
            bos = new ByteArrayOutputStream(); 
            while ((ch = is.read()) != -1) { 
                bos.write(ch); 
            } 
            res = bos.toByteArray(); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (bos != null) 
                    bos.close();  
                if (is != null) 
                    is.close();  
            } catch (Exception e2) { 
                e2.printStackTrace(); 
            } 
        } 
        return res; 
    }  
  
  

}

posted on 2014-05-14 12:15  jiezzy  阅读(1698)  评论(0编辑  收藏  举报