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java中经常会用到模拟http请来发送各种消息,比如说,有get请求,post请求,post请求的参数又包括一般参数和json参数, http工具代码如下:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
/**
* @author 编码小王子
* @date 2018年5月25日 下午6:17:31
* @version 1.0
*/
public class HttpUtils {
// 发送GET请求
public static String sendGet(String url, Map<String, String> parameters) {
String result = "";
BufferedReader in = null;// 读取响应输入流
StringBuffer sb = new StringBuffer();// 存储参数
String params = "";// 编码之后的参数
try {
// 编码请求参数
if (parameters.size() == 1) {
for (String name : parameters.keySet()) {
sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));
}
params = sb.toString();
} else {
for (String name : parameters.keySet()) {
sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8")).append("&");
}
String temp_params = sb.toString();
params = temp_params.substring(0, temp_params.length() - 1);
}
String full_url = url + "?" + params;
System.out.println(full_url);
// 创建URL对象
java.net.URL connURL = new java.net.URL(full_url);
// 打开URL连接
java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();
// 设置通用属性
httpConn.setRequestProperty("Accept", "*/*");
httpConn.setRequestProperty("Connection", "Keep-Alive");
httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
// 建立实际的连接
httpConn.connect();
// 响应头部获取
Map<String, List<String>> headers = httpConn.getHeaderFields();
// 遍历所有的响应头字段
for (String key : headers.keySet()) {
System.out.println(key + "\t：\t" + headers.get(key));
}
// 定义BufferedReader输入流来读取URL的响应,并设置编码方式
in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));
String line;
// 读取返回的内容
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
//发送POST请求
public static String sendPost(String url, Map<String, String> parameters) {
String result = "";// 返回的结果
BufferedReader in = null;// 读取响应输入流
PrintWriter out = null;
StringBuffer sb = new StringBuffer();// 处理请求参数
String params = "";// 编码之后的参数
try {
// 编码请求参数
if (parameters.size() == 1) {
for (String name : parameters.keySet()) {
sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));
}
params = sb.toString();
} else {
for (String name : parameters.keySet()) {
sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"))
.append("&");
}
String temp_params = sb.toString();
params = temp_params.substring(0, temp_params.length() - 1);
}
// 创建URL对象
java.net.URL connURL = new java.net.URL(url);
// 打开URL连接
java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();
// 设置通用属性
httpConn.setRequestProperty("Accept", "*/*");
httpConn.setRequestProperty("Connection", "Keep-Alive");
httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
// 设置POST方式
httpConn.setDoInput(true);
httpConn.setDoOutput(true);
// 获取HttpURLConnection对象对应的输出流
out = new PrintWriter(httpConn.getOutputStream());
// 发送请求参数
out.write(params);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应，设置编码方式
in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));
String line;
// 读取返回的内容
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
}
二,如何调用 1,发送GET请求
Map<String,String> params = new HashMap<String,String>();
params.put("user", "lgg");
String result = HttpUtils.sendGet("https://mp.csdn.net/postedit", params);
System.out.println("结果是:"+result);
2,发送POST一般请求
Map<String,String> params = new HashMap<String,String>();
params.put("user", "lgg");
String result = HttpUtils.sendPost("https://mp.csdn.net/postedit", params);
System.out.println("结果是:"+result);
3,发送POST的json请求
User user = new User();
user.setName("张三");
user.setAge(18);
Map<String,String> params = new HashMap<String,String>();
params.put("queryJson", JSON.toJSONString(user));
String result = HttpUtils.sendPost("https://mp.csdn.net/postedit", params);
System.out.println("结果是:"+result);
【转载】原文地址：https://blog.csdn.net/u011900448/article/details/80599938
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