httpClient 使用multipart/form-data 类型上传文件及表单

public static void post() throws ClientProtocolException, IOException {
//          	Proxy p=new Proxy();
//		p.setHost("192.168.1.153");
//		p.setPort("8888");
    	
        HttpClient httpclient = new DefaultHttpClient();
        
//        HttpHost proxy = new HttpHost(p.getHost(), Integer.valueOf(p.getPort()), "http"); 
//        httpclient.getParams().setParameter(ConnRouteParams.DEFAULT_PROXY, proxy);
        //请求路径
        HttpPost post = new HttpPost("xxxxx");
//添加header头信息
        post.setHeader("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)");
//注 这里一定不能添加 content-Type:multipart/form-data 属性 因为这里面有个boundary参数属性是不可控的。这个值是由浏览器生成的。如果强行指明和可能
//导致边界值不一致 就会请求失败 详细参见 http://blog.youkuaiyun.com/xiaojianpitt/article/details/6856536

//      post.setHeader("content-Type", "multipart/form-data");
        post.setHeader("Host", "****");
        post.setHeader("Accept-Encoding","gzip");
        post.setHeader("charset", "utf-8");
        FileBody fileBody = new FileBody(new File("xxxx"),"image/pjpeg","utf-8");
        MultipartEntity entity = new MultipartEntity();
//添加消息体信息       
        entity.addPart("xxxx", new StringBody("xxx",Charset.forName("utf-8")));
        entity.addPart("imagefile", fileBody);
        post.setEntity(entity);
        HttpResponse response = httpclient.execute(post);  
        if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){    
              
            HttpEntity entitys = response.getEntity();  
            if (entity != null) {  
                System.out.println(EntityUtils.toString(entitys));  
            }  
        }  
        httpclient.getConnectionManager().shutdown();  
    }

如果设置了content-Type: multipart/form-data

可以使用抓包工具拦截请求

这是是缺少boundary参数的

正常的应该是存在的(边界值不一样就会导致content-length=0 就是发送的消息体是空的)