一：对Http不了解的请看

二、正文

1、xUtils 下载地址

2、关于网络请求的方法

package com.jike.shanglv.NetAndJson;

import java.io.File;

import com.lidroid.xutils.HttpUtils;

import com.lidroid.xutils.exception.HttpException;

import com.lidroid.xutils.http.RequestParams;

import com.lidroid.xutils.http.ResponseInfo;

import com.lidroid.xutils.http.ResponseStream;

import com.lidroid.xutils.http.callback.RequestCallBack;

import com.lidroid.xutils.http.client.HttpRequest;

import com.lidroid.xutils.util.LogUtils;

public class HttpUtil {

String result = "" ;

/**

* Get请求 异步的

* @param url 服务器地址

* @param userkey

* @param str

* @param sign 签名

* @return

*/

public String xutilsGet( String url , String userkey , String str , String sign ){

RequestParams params = new RequestParams();

params.addQueryStringParameter("userkey", userkey );

params.addQueryStringParameter("str", str );

params.addQueryStringParameter("sign", sign );

HttpUtils http = new HttpUtils();

http.configCurrentHttpCacheExpiry(1000 * 10); //设置超时时间 10s

http.send(HttpRequest.HttpMethod.GET,

url ,

new RequestCallBack(){

@Override

public void onLoading(long total, long current, boolean isUploading) {

}

@Override

public void onSuccess(ResponseInfo responseInfo) {

result = responseInfo.result.toString() ;

}

@Override

public void onStart() {

}

@Override

public void onFailure(HttpException error, String msg) {

}

});

return result ;

}

/**

* Post请求 异步的

* @param url

* @param userkey

* @param str

* @param sign

* @return

*/

public String xutilsPost( String url , String userkey , String str , String sign ){

RequestParams params = new RequestParams();

params.addQueryStringParameter("userkey", userkey );

params.addQueryStringParameter("str", str );

params.addQueryStringParameter("sign", sign );

// 只包含字符串参数时默认使用BodyParamsEntity，

// 类似于UrlEncodedFormEntity("application/x-www-form-urlencoded")。

//params.addBodyParameter("name", "value");

// 加入文件参数后默认使用MultipartEntity("multipart/form-data")，

// 如需"multipart/related"，xUtils中提供的MultipartEntity支持设置subType为"related"。

// 使用params.setBodyEntity(httpEntity)可设置更多类型的HttpEntity(如：

// MultipartEntity,BodyParamsEntity,FileUploadEntity,InputStreamUploadEntity,StringEntity)。

// 例如发送json参数：params.setBodyEntity(new StringEntity(jsonStr,charset));

HttpUtils http = new HttpUtils();

http.configCurrentHttpCacheExpiry(1000 * 10); //设置超时时间 10s

http.send(HttpRequest.HttpMethod.POST ,

url ,

params,

new RequestCallBack() {

@Override

public void onStart() {

}

@Override

public void onLoading(long total, long current, boolean isUploading) {

}

@Override

public void onSuccess(ResponseInfo responseInfo) {

result = responseInfo.result.toString() ;

}

@Override

public void onFailure(HttpException error, String msg) {

}

});

return result ;

}

/**

* 带上传文件的 Post请求 异步的

* @param url

* @param userkey

* @param str

* @param sign

* @param picString 文件的地址

* @return

*/

public String xutilsFilePost( String url , String userkey , String str , String sign , String picString ){

RequestParams params = new RequestParams();

params.addQueryStringParameter("userkey", userkey );

params.addQueryStringParameter("str", str );

params.addQueryStringParameter("sign", sign );

// 只包含字符串参数时默认使用BodyParamsEntity，

// 类似于UrlEncodedFormEntity("application/x-www-form-urlencoded")。

//params.addBodyParameter("name", "value");

// 加入文件参数后默认使用MultipartEntity("multipart/form-data")，

// 如需"multipart/related"，xUtils中提供的MultipartEntity支持设置subType为"related"。

// 使用params.setBodyEntity(httpEntity)可设置更多类型的HttpEntity(如：

// MultipartEntity,BodyParamsEntity,FileUploadEntity,InputStreamUploadEntity,StringEntity)。

// 例如发送json参数：params.setBodyEntity(new StringEntity(jsonStr,charset));

params.addBodyParameter("picture", new File( picString )) ;

com.lidroid.xutils.HttpUtils http = new com.lidroid.xutils.HttpUtils();

http.send(HttpRequest.HttpMethod.POST ,

url ,

params,

new RequestCallBack() {

@Override

public void onStart() {

}

@Override

public void onLoading(long total, long current, boolean isUploading) {

}

@Override

public void onSuccess(ResponseInfo responseInfo) {

result = responseInfo.result.toString() ;

}

@Override

public void onFailure(HttpException error, String msg) {

}

});

return result ;

}

//-------------------以上的代码 是 异步请求的， 以下的代码是同步请求的-------------------------//

/**

* Get同步请求 必须在异步块儿中执行

* @param url

* @param userkey

* @param str

* @param sign

* @return

*/

private String xutilsGetSync(String url , String userkey , String str , String sign ) {

RequestParams params = new RequestParams();

params.addQueryStringParameter("userkey", userkey );

params.addQueryStringParameter("str", str );

params.addQueryStringParameter("sign", sign );

HttpUtils http = new HttpUtils() ;

http.configCurrentHttpCacheExpiry(1000 * 10); //设置超时时间

try {

ResponseStream responseStream = http.sendSync(HttpRequest.HttpMethod.GET,

url ,

params ) ;

//int statusCode = responseStream.getStatusCode();

//Header[] headers = responseStream.getBaseResponse().getAllHeaders();

return responseStream.readString();

} catch (Exception e) {

LogUtils.e(e.getMessage(), e);

}

return null;

}

/**

* Post同步请求 必须在异步块儿中执行

* @param url

* @param userkey

* @param str

* @param sign

* @return

*/

private String xutilsPostSync(String url , String userkey , String str , String sign ) {

RequestParams params = new RequestParams();

params.addQueryStringParameter("userkey", userkey );

params.addQueryStringParameter("str", str );

params.addQueryStringParameter("sign", sign );

HttpUtils http = new HttpUtils() ;

http.configCurrentHttpCacheExpiry(1000 * 10); //设置超时时间

try {

ResponseStream responseStream = http.sendSync(HttpRequest.HttpMethod.POST ,

url ,

params ) ;

//int statusCode = responseStream.getStatusCode();

//Header[] headers = responseStream.getBaseResponse().getAllHeaders();

return responseStream.readString();

} catch (Exception e) {

LogUtils.e(e.getMessage(), e);

}

return null;

}

}

来源：https://www.cnblogs.com/zhaoyanjun/p/4477089.html