调用图片上传http接口，利用httpClient模拟请求

public static JSONObject postImg(String url, File savedDir,
String saveFileName) {


HttpClient client = new HttpClient();
// 返回结果集
JSONObject resJson = new JSONObject();


try {
// 判断白村文件存不存在
if (!savedDir.exists()) {
resJson.put("status", "-1");
resJson.put("msg", "保存文件不存在");
return resJson;
}
PostMethod postMethod = new PostMethod(url);


// FilePart：用来上传文件的类
FilePart filePart = new FilePart("img", new File(savedDir,
saveFileName));
Part[] parts = { filePart };
// 对于MIME类型的请求，httpclient建议全用MulitPartRequestEntity进行包装
MultipartRequestEntity mre = new MultipartRequestEntity(parts,
postMethod.getParams());
postMethod.setRequestEntity(mre);


// 执行请求，返回状态码
int status = client.executeMethod(postMethod);


if (status == HttpStatus.SC_OK) {
LOG.info("上传到易信服务器请求成功，返回信息："
+ postMethod.getResponseBodyAsString());
String result = postMethod.getResponseBodyAsString();
if (result != null && !result.trim().equals("")) {
// 解析返回信息
resJson = JSONObject.parseObject(result);
String code = resJson.get("errcode").toString(); // 对方接口请求返回结果：0成功
// 其余失败
if (code != null && code.trim().equals("0")) {
LOG.info("上传成功。返回信息："
+ postMethod.getResponseBodyAsString());
resJson.put("status", "0");
return resJson;
} else {
LOG.info("上传失败。返回信息：" + resJson.get("msg").toString());
resJson.put("status", "-1");
return resJson;
}
}
} else {
LOG.info("请求易信接口上传图片，请求失败。");
resJson.put("status", "-1");
resJson.put("msg", "上传图片，请求失败。");
return resJson;
}
} catch (Exception e) {
resJson.put("status", "-1");
resJson.put("msg", "系统异常");
return resJson;
}
return null;
}