java后端通过url接口获取甲方数据库并转化为json
import org.json.JSONObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class GetJson {
public JSONObject getHttpJson(String url, int comefrom) throws Exception {
try {
System.out.println("url:"+url);
URL realUrl = new URL(url);
HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
connection.connect();
System.out.println("code:"+connection.getResponseCode());
System.out.println("getErrorStream："+connection.getErrorStream());
//请求成功
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
InputStream is = connection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//10MB的缓存
byte[] buffer = new byte[10485760]; //is.available()
int len = 0;
while ((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
String jsonString = baos.toString();
baos.close();
is.close();
//转换成json数据处理
// getHttpJson函数的后面的参数1，表示返回的是json数据，2表示http接口的数据在一个（）中的数据
JSONObject jsonArray = getJsonString(jsonString, comefrom);
return jsonArray;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public JSONObject getJsonString(String str, int comefrom) throws Exception{
JSONObject jo = null;
if(comefrom==1){
return new JSONObject(str);
}else if(comefrom==2){
int indexStart = 0;
//字符处理
for(int i=0;i<str.length();i++){
if(str.charAt(i)=='('){
indexStart = i;
break;
}
}
String strNew = "";
//分割字符串
for(int i=indexStart+1;i<str.length()-1;i++){
strNew += str.charAt(i);
}
return new JSONObject(strNew);
}
return jo;
}
}