java请求http服务-参数是@RequestBody String resultJson 类型
当对方的接口参数是@RequestBody类型时如何调用。1、对方controller接口写发如下：
@PostMapping(value = "/test")
@ResponseBody
public StringresultBack(@RequestBody StringresultJson) {
return"helloWorld";
}2、Apipost的调用方式如下：
3、用java代码调用对方接口方法
（1）引入依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
httpcore</artifactId>
<version>4.4.10</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
httpclient</artifactId>
<version>4.5.6</version>
</dependency> （2）调用方法
/**
* @param httpUrl 请求的url
* @param jsonParam 原始JSON字符串参数
* @return 响应结果
*/
public String doPostJson(String httpUrl, String jsonParam) {
HttpURLConnection connection = null;
InputStream is = null;
OutputStream os = null;
BufferedReader br = null;
String result = null;
try {
URL url = new URL(httpUrl);
// 通过远程url连接对象打开连接
connection = (HttpURLConnection) url.openConnection();
// 设置连接请求方式
connection.setRequestMethod("POST");
// 设置连接主机服务器超时时间：15000毫秒
connection.setConnectTimeout(15000);
// 设置读取主机服务器返回数据超时时间：60000毫秒
connection.setReadTimeout(60000);
// 允许向服务器输出数据
connection.setDoOutput(true);
// 允许从服务器读取数据
connection.setDoInput(true);
// 设置Content-Type为application/json
connection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
// 如果需要设置其他请求头，如Authorization，可以在这里添加
// connection.setRequestProperty("Authorization", "Bearer your_token_here");
// 检查JSON参数是否为空
if (jsonParam == null || jsonParam.trim().isEmpty()) {
throw new IllegalArgumentException("JSON参数不能为空");
}
// 通过连接对象获取一个输出流
os = connection.getOutputStream();
// 写入JSON参数，指定UTF-8编码
os.write(jsonParam.getBytes("UTF-8"));
os.flush();
// 检查响应状态码
int responseCode = connection.getResponseCode();
if (responseCode == 200) {
is = connection.getInputStream();
} else {
// 非200状态码使用错误流
is = connection.getErrorStream();
}
// 处理响应流
if (is != null) {
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sbf = new StringBuffer();
String temp;
while ((temp = br.readLine()) != null) {
sbf.append(temp);
}
result = responseCode == 200 ? sbf.toString() :
"Error (code: " + responseCode + "): " + sbf.toString();
} else {
result = "No response from server, code: " + responseCode;
}
} catch (MalformedURLException e) {
e.printStackTrace();
result = "URL格式错误: " + e.getMessage();
} catch (IllegalArgumentException e) {
e.printStackTrace();
result = "参数错误: " + e.getMessage();
} catch (IOException e) {
e.printStackTrace();
result = "IO异常: " + e.getMessage();
} finally {
// 关闭资源
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// 断开连接
if (connection != null) {
connection.disconnect();
}
}
return result;
}
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