io流操作读取文件返回json等

古城微笑少年丶 2022-12-19 06:03 161阅读 0赞

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileReader;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.OutputStream;  
import java.io.Reader;  
import java.net.HttpURLConnection;  
import java.net.URL;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Map;  
import java.util.Properties;

import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;

import com.sinosoft.splatform.persistent.model.gwlzxt.\*;  
import com.sinosoft.splatform.service.gwlzxt.\*;

import com.sinosoft.splatform.util.PostMenHu;

import net.sf.json.JSONArray;  
import net.sf.json.JSONObject;

import org.apache.http.client.methods.HttpPost;  
import org.apache.http.impl.client.CloseableHttpClient;  
import org.apache.http.impl.client.HttpClients;  
import org.springframework.beans.factory.annotation.Autowired;  
import org.springframework.mock.web.MockMultipartFile;  
import org.springframework.stereotype.Controller;  
import org.springframework.transaction.annotation.Transactional;  
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.ResponseBody;  
import org.springframework.web.multipart.MultipartFile;

import com.alibaba.fastjson.JSON;  
import org.apache.http.HttpEntity;  
import org.apache.http.HttpResponse;  
import org.apache.http.client.methods.HttpGet;  
import org.apache.http.impl.client.CloseableHttpClient;  
import org.apache.http.impl.client.HttpClients;  
import org.apache.http.util.EntityUtils;

//  从本地读取文件，然后返回文件流   这么做的目的是模仿调用 返回流的接口，  可以调用本地文件来实现  调用第二个方法就行   ----------------------

@ResponseBody  
    @RequestMapping("/getUrlFile")  
    public void getUrlFile(String url, HttpServletRequest request, HttpServletResponse response) \{  
      
        String serverUrl = "C:/\\\\Users/\\\\15733/\\\\Desktop/\\\\28045111.pdf";  
        File file = new File(serverUrl);  
        FileInputStream inputStream = null;  
        try \{  
            inputStream = new FileInputStream(file);  
            byte\[\] data = new byte\[(int) file.length()\];  
            int length = inputStream.read(data);  
            inputStream.close();  
            response.setContentType("text/plain; charset=utf-8");   
            OutputStream stream = response.getOutputStream();  
            stream.write(data);  
            stream.flush();  
            stream.close();  
        \} catch (FileNotFoundException e) \{  
            e.printStackTrace();  
        \} catch (IOException e) \{  
            e.printStackTrace();  
        \}  
    \}

//  返回的类型可以按照自己的功能封装

public MultipartFile getIo(String title) \{  
        MultipartFile multipartFile;  
        HttpURLConnection urlConnection = null;  
        InputStream inputStream = null;  
        try\{  
            URL url = new URL("http://localhost:8085/ProPushDocumentController/getUrlFile");  
            urlConnection = (HttpURLConnection)url.openConnection();  
            urlConnection.setRequestMethod("POST");  
            urlConnection.setDoOutput(true);  
            urlConnection.setDoInput(true);  
            urlConnection.setUseCaches(false);  
            urlConnection.setRequestProperty("Content-Type", "application/json; charset="+"utf-8");  
            urlConnection.connect();  
            inputStream = urlConnection.getInputStream();  
            multipartFile = new MockMultipartFile(title,title,"", inputStream);  
            return multipartFile;  
        \}catch (Exception e)\{  
            System.out.println("getFile error: " + e);  
        \}finally \{  
            try \{  
                inputStream.close();  
                  urlConnection.disconnect();  
            \} catch (IOException e) \{  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            \}  
        \}  
        return null;  
    \}

\----------------------------结束 -------------------

\----------------------------开始 --------------------

// 从本地读取文件，返回json格式   这么做的目的是模仿调用 返回json的接口，  可以调用本地文件来实现

@ResponseBody  
    @RequestMapping("/getJsonApi")  
    public com.alibaba.fastjson.JSONObject getJsonApi() throws Exception \{  
        String jsonStr = "";  
        try \{  
            File jsonFile = new File("C:/\\\\Users/\\\\15733/\\\\Desktop/\\\\111.txt");  
            FileReader fileReader = new FileReader(jsonFile);  
            Reader reader = new InputStreamReader(new FileInputStream(jsonFile),"utf-8");  
            int ch = 0;  
            StringBuffer sb = new StringBuffer();  
            while ((ch = reader.read()) != -1) \{  
                sb.append((char) ch);  
            \}  
            fileReader.close();  
            reader.close();  
            jsonStr = sb.toString();  
            com.alibaba.fastjson.JSONObject jobj = JSON.parseObject(jsonStr);  
            return jobj;  
        \} catch (IOException e) \{  
            e.printStackTrace();  
        \}  
        return null;  
    \}

public   com.alibaba.fastjson.JSONObject apiStream() \{  
        CloseableHttpClient hc=HttpClients.createDefault();  
        //一个get请求对象，包装的请求地址,相当于浏览器中输入了网址  
        HttpPost get=new HttpPost("http://localhost:8085/ProPushDocumentController/getJsonApi");  
        //当客户端关闭请求的时候,通知服务端也关闭连接。  
        get.setHeader("Connection","close");  
        HttpResponse resp=null;  
        HttpEntity entity=null;  
        try \{  
            resp=hc.execute(get);      
            entity=resp.getEntity();      
            String result=EntityUtils.toString(entity);  
            com.alibaba.fastjson.JSONObject jo=new com.alibaba.fastjson.JSONObject();  
            return jo.parseObject(result);  
        \}catch (Exception e) \{  
            e.printStackTrace();  
        \}finally \{  
            try \{  //关闭连接  
                if(entity!=null)EntityUtils.consume(entity);  
                if(get!=null)get.abort();  
                if(hc!=null)hc.close();  
            \} catch (Exception e) \{  
                e.printStackTrace();  
            \}  
        \}      
        return null;  
    \}

\---------------------------------------结束----------------------------------------------