目录
- 使用GET方法,访问GET接口,服务端返回405
- 使用GET方法,访问POST接口,服务端返回405
- 使用POST方法,访问GET接口,服务端返回405
使用GET方法,访问GET接口,服务端返回405
发生场景:
复制的POST请求代码,手动修改为GET,没有修改彻底,导致错误。
错误代码:
public class GET405 {public static void main(String[] args) {try {String defURL = "https://httpbin.org/get";URL url = new URL(defURL);// 打开和URL之间的连接HttpURLConnection con = (HttpURLConnection) url.openConnection();con.setRequestMethod("GET");//请求get方式con.setDoInput(true);// 默认值为 truecon.setDoOutput(true);//默认值为 false,传body参数必须写// 得到请求的输出流对象OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream(), "UTF-8");String body = "username=xiaohu&password=123456";writer.write(body);writer.flush();// System.out.println("http请求方法:"+con.getRequestMethod());System.out.println("http状态码:" + con.getResponseCode());// 获取服务端响应,通过输入流来读取URL的响应InputStream is = con.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}reader.close();// 关闭连接con.disconnect();// 打印读到的响应结果System.out.println("运行结束:" + sbf.toString());} catch (Exception e) {e.printStackTrace();}}
}
报错log:
405原因:
con.getOutputStream()
会把原有的GET方法改为POST方法,用POST方法访问GET接口,就报错405。看jdk1.8中HttpURLConnection
的getOutpuStream()方法的源码:
解决办法:删掉getOutputStream(),用url传参。
正确代码:
public class GET200 {public static void main(String[] args) {try {String defURL = "https://httpbin.org/get";String body = "username=xiaohu&password=123456";URL url = new URL(defURL+"?"+body);// 打开和URL之间的连接HttpURLConnection con = (HttpURLConnection) url.openConnection();con.setRequestMethod("GET");//请求get方式// System.out.println("http请求方法:"+con.getRequestMethod());System.out.println("http状态码:" + con.getResponseCode());// 获取服务端响应,通过输入流来读取URL的响应InputStream is = con.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}reader.close();// 关闭连接con.disconnect();// 打印读到的响应结果System.out.println("运行结束:" + sbf.toString());} catch (Exception e) {e.printStackTrace();}}
}
运行结果:
http状态码:200
运行结束:{"args": {"password": "123456", "username": "xiaohu"}, "headers": {"Accept": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2", "Host": "httpbin.org", "User-Agent": "Java/1.8.0_221", "X-Amzn-Trace-Id": "Root=1-668a1ba0-278338c97b93d6ca4276c0b0"}, "origin": "113.57.25.151", "url": "https://httpbin.org/get?username=xiaohu&password=123456"
}
使用GET方法,访问POST接口,服务端返回405
发生场景:接口文档显示接口为GET接口,实际上后端人员写的是POST接口,文档没同步。
错误代码:
public class GETtoPOST405 {public static void main(String[] args) {try {String defURL = "https://httpbin.org/post";String body="username=xiaohu&password=123456";URL url = new URL(defURL + "?" + body);HttpURLConnection con = (HttpURLConnection) url.openConnection();
// con.setUseCaches(false); // Post请求不能使用缓存con.setRequestMethod("GET");//请求get方式con.setDoInput(true);// 设置是否从HttpURLConnection输入,默认值为 truecon.setDoOutput(false);// 设置是否使用HttpURLConnection进行输出,默认值为 falseint code = con.getResponseCode();System.out.println("http状态码:" + code);if (code == HttpURLConnection.HTTP_OK) {System.out.println("测试成功");} else {System.out.println("测试失败:" + code);}// 获取服务端响应,通过输入流来读取URL的响应InputStream is = con.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}reader.close();// 关闭连接con.disconnect();// 打印读到的响应结果System.out.println("运行结束:" + sbf.toString());} catch (Exception e) {e.printStackTrace();}}
}
报错log:
http状态码:405
测试失败:405Caused by: java.io.IOException: Server returned HTTP response code: 405 for URL: https://httpbin.org/post?username=xiaohu&password=123456
405原因:不知道后端接口的定义,或者没有沟通彻底,或者后端开发人员失误,本应该是GET定义成了POST。应该使用POST方法。
解决方法:使用POST请求。
正确代码:
public class POSTtoPOST200 {public static void main(String[] args) {try {String defURL = "https://httpbin.org/post";URL url = new URL(defURL);HttpURLConnection con = (HttpURLConnection) url.openConnection();
// con.setUseCaches(false); // Post请求不能使用缓存con.setRequestMethod("POST");//请求POST方式con.setDoOutput(true);// 设置是否使用HttpURLConnection进行输出,默认值为 falseOutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream(), "UTF-8");String body = "username=xiaohu&password=123456";writer.write(body);writer.flush();int code = con.getResponseCode();System.out.println("http状态码:" + code);if (code == HttpURLConnection.HTTP_OK) {System.out.println("测试成功");} else {System.out.println("测试失败:" + code);}// 获取服务端响应,通过输入流来读取URL的响应InputStream is = con.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}reader.close();// 关闭连接con.disconnect();// 打印读到的响应结果System.out.println("运行结束:" + sbf.toString());} catch (Exception e) {e.printStackTrace();}}
}
运行结果:
http状态码:200
测试成功
运行结束:{"args": {}, "data": "", "files": {}, "form": {"password": "123456", "username": "xiaohu"}, "headers": {"Accept": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2", "Content-Length": "31", "Content-Type": "application/x-www-form-urlencoded", "Host": "httpbin.org", "User-Agent": "Java/1.8.0_221", "X-Amzn-Trace-Id": "Root=1-668a2091-2a64856935929fab74082ce4"}, "json": null, "origin": "113.57.25.151", "url": "https://httpbin.org/post"
}
使用POST方法,访问GET接口,服务端返回405
发生场景:代码失误,本该写GET,写成了POST。
错误代码:
public class POSTtoGET405 {public static void main(String[] args) {try {String defURL = "https://httpbin.org/get";URL url = new URL(defURL);// 打开和URL之间的连接HttpURLConnection con = (HttpURLConnection) url.openConnection();con.setRequestMethod("POST");//请求post方式
// con.setUseCaches(false); // Post请求不能使用缓存con.setDoInput(true);// 设置是否从HttpURLConnection输入,默认值为 truecon.setDoOutput(true);// 设置是否使用HttpURLConnection进行输出,默认值为 falseOutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream(), "UTF-8");String body = "username=xiaohu&password=123456";writer.write(body);writer.flush();writer.close();int code = con.getResponseCode();System.out.println("http状态码:" + code);if (code == HttpURLConnection.HTTP_OK) {System.out.println("测试成功");} else {System.out.println("测试失败:" + code);}// 获取服务端响应,通过输入流来读取URL的响应InputStream is = con.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}reader.close();// 关闭连接con.disconnect();// 打印读到的响应结果System.out.println("运行结束:" + sbf.toString());} catch (Exception e) {e.printStackTrace();}}
}
405原因: 接口只接受GET方法,请求是POST方法。
错误场景:后端开发定义失误,本该是POST接口,写成了GET。接口没有测试。
解决办法:用GET访问。正确代码和GET访问GET一样。