正常来讲，按照HTTP标准，GET请求事不能带有消息体BODY的。但是HTTP标准不是硬性规定，各个厂商可以根据自己的需求做成灵活的扩展。比如ES的搜索接口就要求客户端发送带有BODY的HTTP GET请求。
发送请求的代码分成两个类，接收返回数据的 StrResponse 和发起请求的工具栏 HttpUtils
StrResponse.java
import java.util.List;
import java.util.Map;
/**
* 接收HTTP返回数据的对象
* @author zhangchao
*/
public class StrResponse {
private int code = 200;
private Map> headers = null;
private String body = null;
public Map> getHeaders() {
return headers;
}
public String getBody() {
return body;
}
public void setHeaders(Map> headers) {
this.headers = headers;
}
public void setBody(String body) {
this.body = body;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getHeaderStr (String key) {
List list = this.headers.get(key);
StringBuilder sb = new StringBuilder();
for (String str : list) {
sb.append(str);
}
return sb.toString();
}
public String getAllHeaderStr() {
if (null == headers || headers.isEmpty()) {
return "";
}
StringBuilder sb = new StringBuilder();
for (String key : headers.keySet()) {
List list = headers.get(key);
sb.append(key + ":\n");
for (String str : list) {
sb.append(" " + str + "\n");
}
}
return sb.toString();
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("StrResponse{");
sb.append("code=").append(code);
sb.append(", headers=").append(headers);
sb.append(", body='").append(body).append('\'');
sb.append('}');
return sb.toString();
}
}
HttpUtils.java
import java.util.Map;
import java.util.List;
import java.io.*;
import java.net.*;
/**
* 通用http发送方法
*
* @author zhangchao
*/
public class HttpUtils
{
public static StrResponse requestByte_responseStr(final String url, final String method,
final byte[] requestBody,final Map headerMap, String responseEncoding) {
BufferedReader in = null;
BufferedReader errorReader = null;
HttpURLConnection connection = null;
StrResponse strResponse = null;
try {
StringBuilder result = new StringBuilder();
URL realUrl = new URL(url);
// 打开和URL之间的连接
connection = (HttpURLConnection) realUrl.openConnection();
connection.setRequestMethod(method);
// 请求内容的长度
if (null != requestBody && requestBody.length > 0) {
connection.setRequestProperty("Content-Length", String.valueOf(requestBody.length));
}
// 自定义请求头
if (null != headerMap && false == headerMap.isEmpty()) {
Set keySet = headerMap.keySet();
for (String key : keySet) {
connection.setRequestProperty(key, headerMap.get(key));
}
}
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
// 把JSON作为字节流写入post请求的body中
connection.setDoOutput(true);
if (null != requestBody && requestBody.length > 0) {
connection.getOutputStream().write(requestBody);
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream(), responseEncoding));
String line;
while ((line = in.readLine()) != null) {
result.append(line).append("\n");
}
strResponse = new StrResponse();
strResponse.setCode(connection.getResponseCode());
// 返回的header
Map> map = connection.getHeaderFields();
strResponse.setHeaders(map);
// 返回的body
String responseBody = result.toString();
strResponse.setBody(responseBody);
} catch (Exception e) {
e.printStackTrace();
try {
if (null != connection) {
StringBuilder result = new StringBuilder();
// 定义 BufferedReader输入流来读取URL的响应
errorReader = new BufferedReader(new InputStreamReader(
connection.getErrorStream(), responseEncoding));
String line;
while ((line = errorReader.readLine()) != null) {
result.append(line).append("\n");
}
strResponse = new StrResponse();
strResponse.setCode(connection.getResponseCode());
// 返回的header
Map> map = connection.getHeaderFields();
strResponse.setHeaders(map);
// 返回的body
String responseBody = result.toString();
strResponse.setBody(responseBody);
}
} catch (Exception e2) {
e2.printStackTrace();
}
} finally {
try {
if (null != in) {
in.close();
}
if (null != errorReader) {
errorReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return strResponse;
}
public static StrResponse requestStr_responseStr(final String url, final String method, final String requestBody,
final Map headerMap, final String encoding) {
// 字符串转成字节流
byte[] bodyBytes = null;
try {
if (requestBody != null) {
bodyBytes = requestBody.getBytes(encoding);
}
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
return requestByte_responseStr(url, method, bodyBytes, headerMap, encoding);
}
}
使用方法
public class Main{
public static void main(String[] args) {
String url = "http://192.168.19.11:9200/yourindex/_search";
String requestBody = "{" +
"\"query\": {" +
" \"bool\": {" +
" \"must\": [" +
" {" +
" \"term\": {" +
" \"areaName.keyword\": \"" + areaName + "\"" +
" }" +
" }," +
" {" +
" \"term\": {" +
" \"date.keyword\": \"" + date+ "\"" +
" }" +
" }," +
" {" +
" \"term\": {\"rytype.keyword\": \"root\"}" +
" }" +
" ]" +
" }" +
" " +
" }" +
"}";
Map headerMap = new HashMap<>();
headerMap.put("Content-Type", "application/json");
headerMap.put("Referer", url);
String encoding = "UTF-8";
StrResponse strResponse = HttpUtils.requestStr_responseStr(url, "GET", requestBody,
headerMap, encoding);
String body = strResponse.getBody();
logger.info(body);
}
}
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