Java http请求工具类

该工具类可以调用post请求或者get请求，参数以map的方式传入，支持获获取返回值，返回值接收类型为string

 httprequestutil.java

package com.util;

import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.util.list;
import java.util.map;

import net.sf.json.jsonobject;

/**
* 用于模拟http请求中get/post方式
*
* @author https://www.mojxtang.club/
* @date 2017年8月24日
*/
public class httprequestutil {
/**
* 发送get请求
*
* @param url 目的地址
* @param parameters 请求参数，map类型。
* @return 远程响应结果
*/
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
*
* @param url 目的地址
* @param parameters 请求参数，map类型。
* @return 远程响应结果
*/
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;
}

public static string sendposttest(string url, jsonobject json) {
string result = "";// 返回的结果
bufferedreader in = null;// 读取响应输入流
printwriter out = null;
string params = "";// 编码之后的参数
try {
// 编码请求参数
params = json.tostring();
// 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;
}
}

 

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