调用接口获取接口返回信息的几种工具方法

╰半橙微兮° 2022-01-10 22:47 717阅读 0赞

返回值为String类型

/\*\*  
\*  
\* @param urlStr 接口地址  
\* @param paras 请求参数  
\* @param type 调接口传参类型  
\* @return  
\* @throws Exception  
\*/

public static String invokeFareInterface(String urlStr, String paras, String type) throws Exception\{  
OutputStream os = null;  
StringBuffer buffer = null;  
InputStreamReader reader = null;  
// GZIPInputStream in = null;  
try \{  
int c = 0;  
buffer = new StringBuffer();  
  
if(urlStr!=null && !"".equals(urlStr))\{  
URL url = new URL(urlStr);  
HttpURLConnection con = (HttpURLConnection) url.openConnection();  
con.setReadTimeout(60000); // 15s超时  
con.setDoOutput(true);  
if(type!=null && "post".equals(type))\{  
con.setRequestMethod("POST");  
con.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  
\}else\{\}  
os = con.getOutputStream();  
os.write(paras.getBytes());  
os.flush();  
os.close();  
//in = new GZIPInputStream(con.getInputStream());  
int code = con.getResponseCode();  
if (code == 200) \{ // 返回成功  
reader = new InputStreamReader(con.getInputStream(), "UTF-8");  
while ((c = reader.read()) != -1) \{  
buffer.append((char) c);  
\}  
\} else \{ // 访问失败  
throw new Exception("Error occur when try to visit the url:" +  
url.getPath() + " using HttpURLConnection");  
\}  
url = null;  
con = null;  
\}else\{  
//exceptionlog.warn("Invoke 运价接口url为空");  
\}  
\} catch (Exception e) \{  
//exceptionlog.error(this.getClass()+"invoke 运价接口异常:"+e.getMessage());  
// System.out.println(this.getClass()+"invoke 运价接口异常:"+e.getMessage());  
throw new Exception("Error occur execute " +  
"HttpRemoteProxy.performImpl(), the caused by " + e);  
\} finally \{  
if (reader != null) \{  
reader.close();  
\}  
if (os != null) \{  
os.close();  
\}  
// if (in != null) \{  
// in.close();  
// \}  
\}  
return buffer.toString();  
\}

public static String doHttpPostRequest(String url, Object bean) throws Exception \{  
PostMethod postMethod = new PostMethod(url);

try \{  
postMethod.getParams().setContentCharset("utf-8");  
for (Field field : bean.getClass().getDeclaredFields()) \{  
field.setAccessible(true);  
postMethod.setParameter(field.getName(), field.get(bean) == null ? "" : field.get(bean).toString());  
\}  
getHttpClient().executeMethod(postMethod);  
if (postMethod.getStatusCode() == HttpStatus.SC\_OK) \{  
return postMethod.getResponseBodyAsString(200);  
\}  
\} catch (HttpException e) \{  
e.printStackTrace();  
throw e;  
\} catch (IOException e) \{  
e.printStackTrace();  
throw e;  
\} finally \{  
postMethod.releaseConnection();  
if (postMethod != null) \{  
postMethod = null;  
\}  
\}  
return null;  
\}

使用方法调用时应注意如果为get方法调用，应当将参数也放在urlStr里边，param传一个空字符串即可，否则会有错误，底边几个调用方法与此一样

返回值为String

public String getResult(URL url,String sendMsg,String type)\{  
String myResponse = null;  
try \{  
HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
if("1".equals(type))\{  
conn.setRequestMethod("POST");  
\}else if("2".equals(type))\{  
conn.setRequestMethod("GET");  
\}  
conn.setRequestProperty("Proxy-Connection", "Keep-Alive");  
conn.setDoOutput(true);  
conn.setDoInput(true);  
  
OutputStream os = conn.getOutputStream();  
DataOutputStream dos = new DataOutputStream(os);  
dos.write(sendMsg.getBytes("UTF-8"));  
dos.flush();  
dos.close();  
os.close();  
  
InputStream is = conn.getInputStream();  
DataInputStream dis = new DataInputStream(is);  
byte\[\] receivedBytes = new byte\[dis.available()\];  
dis.read(receivedBytes);  
myResponse = new String(receivedBytes);  
System.out.println(myResponse);  
dis.close();  
is.close();  
conn.disconnect();  
\}catch (Exception e) \{  
e.printStackTrace();  
\}  
return myResponse;  
\}

返回值为String

public static String changeUrlStr(URL url, String sendMsg) \{  
StringBuffer buffer = null;  
InputStreamReader reader = null;  
InputStream in = null;  
OutputStreamWriter out = null;  
URLConnection conn = null;  
try \{  
int c=0;  
conn = url.openConnection();  
conn.setDoOutput(true);// 设置输出流  
conn.setConnectTimeout(30\*1000);  
conn.setReadTimeout(30\*1000);  
out = new OutputStreamWriter(conn.getOutputStream(), "utf-8");// 得到输出流  
out.write(sendMsg);// 输出post数据  
out.flush();  
out.close();  
conn.connect();  
//in = conn.getInputStream();// 得到返回的输入流  
buffer = new StringBuffer();  
reader = new InputStreamReader(conn.getInputStream(), "UTF-8");  
while ((c = reader.read()) != -1) \{  
buffer.append((char) c);  
\}  
return buffer.toString();  
\} catch (UnsupportedEncodingException e) \{  
e.printStackTrace();  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
return null;  
\}

返回值为java.io.InputStream类型

/\*\*

\*url为接口地址 sendMsg为参数

\*/

public static InputStream changeUrl(URL url, String sendMsg) \{  
try \{  
InputStream in = null;  
OutputStreamWriter out = null;  
URLConnection conn = null;  
conn = url.openConnection();  
conn.setDoOutput(true);// 设置输出流  
conn.setConnectTimeout(30\*1000);  
conn.setReadTimeout(30\*1000);  
out = new OutputStreamWriter(conn.getOutputStream(), "utf-8");// 得到输出流  
out.write(sendMsg);// 输出post数据  
out.flush();  
out.close();  
conn.connect();  
in = conn.getInputStream();// 得到返回的输入流  
return in;  
\} catch (UnsupportedEncodingException e) \{  
e.printStackTrace();  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
return null;  
\}