生产中遇到过这种问题,记录下java的接口调用问题。
一种是json方式;
public static String sendPost(String url, JSONObject obj)throws IOException{
OutputStreamWriter out = null;
BufferedReader reader = null;
String response=""; /* String paramStr = "";
if (null != param) { //遍历参数Map添加到集合中
Set<String> keySet = param.keySet();
for (String key : keySet) {
paramStr = paramStr + key + ":" + param.get(key) + "&";
}
}
int lastAndIndex = paramStr.lastIndexOf("&");
if (lastAndIndex != -1) {
paramStr = paramStr.substring(0, lastAndIndex);
} System.out.println("地址===" + url);
System.out.println("入参===" + paramStr);*/ try {
URL httpUrl = null; //HTTP URL类 用这个类来创建连接
//创建URL
httpUrl = new URL(url);
//建立连接
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setRequestProperty("accept", "*/*");// 设置通用的请求属性
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("connection", "keep-alive");
conn.setUseCaches(false);//设置不要缓存
conn.setInstanceFollowRedirects(true);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();
//POST请求
out = new OutputStreamWriter(
conn.getOutputStream());
out.write(obj.toJSONString());
out.flush();
//读取响应
reader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String lines;
while ((lines = reader.readLine()) != null) {
lines = new String(lines.getBytes(), "utf-8");
response+=lines;
}
reader.close();
// 断开连接
conn.disconnect();
} 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(reader!=null){
reader.close();
}
}
catch(IOException ex){
ex.printStackTrace();
}
} return response;
}
再来一个普通的str 调用接口;
/**
* 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 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPostWebReq(String url, Map<String, Object> param,int i) throws Exception {
String paramStr = "";
if (null != param) { //遍历参数Map添加到集合中
Set<String> keySet = param.keySet();
for (String key : keySet) {
paramStr = paramStr + key + "=" + param.get(key) + "&";
}
}
int lastAndIndex = paramStr.lastIndexOf("&");
if (lastAndIndex != -1) {
paramStr = paramStr.substring(0, lastAndIndex);
} System.out.println("地址===" + url);
System.out.println("入参===" + paramStr); PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();// 打开和URL之间的连接
conn.setRequestProperty("accept", "*/*");// 设置通用的请求属性
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setDoOutput(true);// 发送POST请求必须设置如下两行
conn.setDoInput(true);// 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(paramStr);// flush输出流的缓冲
out.flush();
in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));// 定义BufferedReader输入流来读取URL的响应
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常!" + e);
throw e;
} finally { // 使用finally块来关闭输出流、输入流
try {
if (in != null) in.close();
} catch (IOException ex) { }
if (out != null) out.close();
}
return result;
}