HttpClient上传文件的方式MultipartRequestEntity

HttpClient访问第三方项目接口上传文件的实现方案，并解决中文乱码问题，并且在上传文件的时候传输多个其他参数；

第一种方案，中文参数在url内部，使用URLEncoder类对中文进行encode：

public static void postTwo() throws Exception{
HttpClient client = new HttpClient();
//登录
PostMethod post = new PostMethod("http://127.0.0.1:8080/HelloWorld/post?host=172.16.2.183&port=10086&name=test&pw=test" + URLEncoder.encode("北京", "utf-8"));
FilePart fp = new FilePart("formFile", new File("D://PTOC_SCENIC_DAY_2015043015.txt"));
Part[] parts = {fp};
MultipartRequestEntity entity = new MultipartRequestEntity(parts, new HttpMethodParams());
post.setRequestEntity(entity);
client.executeMethod(post);
//释放连接，以免超过服务器负荷
System.out.println("============================");
System.out.println(post.getResponseBodyAsString());
System.out.println("============================");
//释放连接，以免超过服务器负荷
post.releaseConnection();
}

第二种方案，使用Part类，该类有两个子类，一个StringPart，一个FilePart，StringPart用于传输普通字符串参数，FilePart用于上传文件：

public static void postThree() throws Exception{
HttpClient client = new HttpClient();
//登录
PostMethod post = new PostMethod("http://127.0.0.1:8080/HelloWorld/post");
FilePart fp = new FilePart("formFile", "JNDI.txt", new File("D://JNDI配置数据库连接池_获取数据库连接.txt"));
fp.setCharSet("utf-8");
System.out.println(fp.getCharSet());
Part[] parts = { fp, new StringPart("host", "172.16.2.183", "UTF-8"),
new StringPart("port", "10086", "UTF-8"),
new StringPart("name", "test色鬼", "UTF-8"),
new StringPart("pw", "test特殊", "UTF-8") };
MultipartRequestEntity entity = new MultipartRequestEntity(parts, new HttpMethodParams());
post.setRequestEntity(entity);
System.out.println(entity.getContentType());
client.executeMethod(post);
//释放连接，以免超过服务器负荷
System.out.println("============================");
System.out.println(post.getResponseBodyAsString());
System.out.println("============================");
//释放连接，以免超过服务器负荷
post.releaseConnection();
}

以上两种方案对应的第三方项目的接口代码如下：

@RequestMapping(value = "/post", method = { RequestMethod.POST })
public @ResponseBody Map<String, Object> post(@RequestParam(value = "host") String host,
@RequestParam("port") String port,
@RequestParam("name") String name,
@RequestParam("pw") String pw,
@RequestParam("formFile") MultipartFile formFile) {
Map<String, Object> map = new HashMap<String, Object>();
try{
map.put("tag", "1");
map.put("msg", "上传成功!");
System.out.println(host + ":" + port + " " + name + " " + pw);
String fileName = formFile.getOriginalFilename();
FileOutputStream write = new FileOutputStream("D://ww" + fileName);
InputStream read = formFile.getInputStream();
byte data[] = new byte[1024];
int count;
while ((count = read.read(data, 0, 1024)) != -1) {
write.write(data, 0, count);
}
read.close();
write.close();
}catch (Exception e) {
e.printStackTrace();
map.put("tag", "0");
map.put("msg", "上传失败:" + e.getMessage());
}
return map;
}

这两只方案都只能解决普通字符串参数的中文乱码问题，对于上传的文件其文件名中文乱码问题不能使用setCharSet方法设置编码方式解决，至于原因，查看源码就可以知道，StringPart和FilePart类中对中午的处理方式不一样，FilePart在转换文件名时，用的方法是EncodingUtil.getAsciiBytes()，查看这个方法源码为data.getBytes("US-ASCII")，因此中文文件名必定乱码，不管你是否调用了setCharSet("GBK")方法。解决很简单：out.write(EncodingUtil.getBytes(filename, getCharSet()));想要解决附件文件名中文乱码只能靠修改源码了，FilePart中对中午乱码起至关重要的部分为：

protected void sendDispositionHeader(OutputStream out) throws IOException {
LOG.trace("enter sendDispositionHeader(OutputStream out)");
super.sendDispositionHeader(out);
String filename = this.source.getFileName();
if (filename != null) {
out.write(FILE_NAME_BYTES);
out.write(QUOTE_BYTES);
out.write(EncodingUtil.getAsciiBytes(filename));
out.write(QUOTE_BYTES);
}
}

HttpClient上传文件的方式MultipartRequestEntity

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