标签：HttpRequest Java 请求 URL setRequestProperty new null conn String
package com.xieh;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
/**
* Http请求封装类，封装常用的Get，Post请求方法
*
* @author 谢辉
*
*/
public class HttpRequest {
/**
* 向指定URL发送GET方法的请求
*
* @param url 发送请求的URL
* @param params 请求参数，
* @param headers 请求头参数
* @return result 所代表远程资源的响应结果
*/
public static String sendGet(String url, Map<String, Object> params, Map<String, Object> headers) {
String param = "";
if (params != null) {
int length = params.size();
int count = 1;
Set<Entry<String, Object>> entrySet = params.entrySet();
for (Entry<String, Object> entry : entrySet) {
if (count < length) {
param += entry.getKey() + "=" + entry.getValue() + "&";
} else {
param += entry.getKey() + "=" + entry.getValue();
break;
}
count++;
}
}
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
// connection.setRequestProperty("Accept-Charset", "UTF-8");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 添加用户设置的请求头
if (headers != null) {
Set<Entry<String, Object>> headerEntrySet = headers.entrySet();
for (Entry<String, Object> entry : headerEntrySet) {
connection.setRequestProperty(entry.getKey(), entry.getValue().toString());
}
}
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
// for (String key : map.keySet()) {
// System.out.println(key + "--->" + map.get(key));
// }
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, "utf-8");
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
/**
* 向指定URL发送GET方法的请求
*
* @param url 发送请求的URL
* @param params 请求参数
* @param headers 请求头参数
* @param encoding 设置响应信息的编码格式，如utf-8
* @return result 所代表远程资源的响应结果
*/
public static String sendGet(String url, Map<String, Object> params, Map<String, Object> headers, String encoding) {
String param = "";
if (params != null) {
int length = params.size();
int count = 1;
Set<Entry<String, Object>> entrySet = params.entrySet();
for (Entry<String, Object> entry : entrySet) {
if (count < length) {
param += entry.getKey() + "=" + entry.getValue() + "&";
} else {
param += entry.getKey() + "=" + entry.getValue();
break;
}
count++;
}
}
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 添加用户设置的请求头
if (headers != null) {
Set<Entry<String, Object>> headerEntrySet = headers.entrySet();
for (Entry<String, Object> entry : headerEntrySet) {
connection.setRequestProperty(entry.getKey(), entry.getValue().toString());
}
}
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
// for (String key : map.keySet()) {
// System.out.println(key + "--->" + map.get(key));
// }
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, encoding);
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param param 请求参数，请求参数应该是Json格式字符串的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String jsonData, Map<String, Object> headers) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection con = realUrl.openConnection();
HttpURLConnection conn = (HttpURLConnection) con;
// 设置通用的请求属性
conn.setRequestMethod("POST"); // 设置Post请求
conn.setConnectTimeout(5 * 1000);
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // 设置内容类型
// 添加用户设置的请求头
if (headers != null) {
Set<Entry<String, Object>> headerEntrySet = headers.entrySet();
for (Entry<String, Object> entry : headerEntrySet) {
conn.setRequestProperty(entry.getKey(), entry.getValue().toString());
}
}
// conn.setRequestProperty("Content-Length",
// String.valueOf(param.length())); //设置长度
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
// 发送请求参数
// out.print(param);
out.write(jsonData);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, "utf-8");
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
public static String sendPost(String url, String jsonData, Map<String, Object> headers, String encoding,
String authorization, String postmanToken) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection con = realUrl.openConnection();
HttpURLConnection conn = (HttpURLConnection) con;
// 设置通用的请求属性
conn.setRequestMethod("POST"); // 设置Post请求
conn.setConnectTimeout(5 * 1000);
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // 设置内容类型
conn.setRequestProperty("authorization", authorization);
conn.setRequestProperty("postman-token", postmanToken);
// 添加用户设置的请求头
if (headers != null) {
Set<Entry<String, Object>> headerEntrySet = headers.entrySet();
for (Entry<String, Object> entry : headerEntrySet) {
conn.setRequestProperty(entry.getKey(), entry.getValue().toString());
}
}
// conn.setRequestProperty("Content-Length",
// String.valueOf(param.length())); //设置长度
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), encoding));
// 发送请求参数
// out.print(param);
out.write(jsonData);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, encoding);
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param jsonData 请求参数，请求参数应该是Json格式字符串的形式。
* @param encoding 设置响应信息的编码格式，如utf-8
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String jsonData, Map<String, Object> headers, String encoding) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection con = realUrl.openConnection();
HttpURLConnection conn = (HttpURLConnection) con;
// 设置通用的请求属性
conn.setRequestMethod("POST"); // 设置Post请求
conn.setConnectTimeout(5 * 1000);
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // 设置内容类型
// 添加用户设置的请求头
if (headers != null) {
Set<Entry<String, Object>> headerEntrySet = headers.entrySet();
for (Entry<String, Object> entry : headerEntrySet) {
conn.setRequestProperty(entry.getKey(), entry.getValue().toString());
}
}
// conn.setRequestProperty("Content-Length",
// String.valueOf(param.length())); //设置长度
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), encoding));
// 发送请求参数
// out.print(param);
out.write(jsonData);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, encoding);
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
/**
* 上传媒体文件
*
* @param url 上传媒体文件的微信公众平台接口地址
* @param file 要上传的媒体文件对象
* @return 返回上传的响应结果，详情参看微信公众平台开发者接口文档
*/
public static String uploadPost(String url, File file) {
DataOutputStream dos = null;
FileInputStream fis = null;
DataInputStream dis = null;
BufferedReader in = null;
String result = "";
String end = "\r\n";
String twoHyphens = "--"; // 用于拼接
String boundary = "*****"; // 用于拼接 可自定义
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection con = realUrl.openConnection();
HttpURLConnection conn = (HttpURLConnection) con;
// 设置通用的请求属性
conn.setRequestMethod("POST"); // 设置Post请求
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(5 * 1000);
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary); // 设置内容类型
// 获取URLConnection对象对应的输出流
dos = new DataOutputStream(conn.getOutputStream());
// 1、写入媒体头部分
StringBuilder sb = new StringBuilder();
sb.append(twoHyphens).append(boundary).append(end);
sb.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"").append(end);
sb.append("Content-Type:application/octet-stream").append(end).append(end);
byte[] head = sb.toString().getBytes("utf-8");
dos.write(head);
// 2、写入媒体正文部分， 对文件进行传输
fis = new FileInputStream(file);
dis = new DataInputStream(fis);
byte[] buffer = new byte[8192]; // 8K
int count = 0;
while ((count = dis.read(buffer)) != -1) {
dos.write(buffer, 0, count);
}
// 3、写入媒体结尾部分。
byte[] foot = (end + twoHyphens + boundary + twoHyphens + end).getBytes("utf-8");
dos.write(foot);
dos.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
byte[] bresult = result.getBytes();
result = new String(bresult, "utf-8");
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (dos != null) {
dos.close();
}
if (dis != null) {
dis.close();
}
if (fis != null) {
fis.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
}
标签：HttpRequest,Java,请求,URL,setRequestProperty,new,null,conn,String 来源： https://www.cnblogs.com/xiejn/p/14017757.html
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