java实现http调用servlet，并且进行参数传递

太过爱你忘了你带给我的痛 2022-11-05 01:58 72阅读 0赞

首先，创建servlet，如下：

package com.apache.https.sinosoft.servlet;
    
    
    import com.apache.https.sinosoft.common.FTPUtils;
    import com.apache.https.sinosoft.common.SysConfig;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Value;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.List;
    
    @WebServlet(urlPatterns = "/ZBFReconciliationServlet")
    public class ZBFReconciliationServlet extends HttpServlet {
        private static Logger logger = LoggerFactory.getLogger(ZBFReconciliationServlet.class);
        private static final long serialVersionUID = 1L;
    
        public ZBFReconciliationServlet() throws IOException {
            super();
        }
    
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            response.getWriter().print("My SpringBoot Servlet");
            response.getWriter().flush();
            response.getWriter().close();
        }
    
        /**
         * 下载对账文件至本地服务器——中保付
         * @param request
         * @param response
         * @throws ServletException
         * @throws IOException
         */
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            logger.info("下载对账文件开始---->begin");
            System.out.println("=================="+new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())+"=====================");
            request.setCharacterEncoding("utf-8");
            String date = request.getParameter("date");
    
            String ftpIP = SysConfig.getPropertity("ZBFFTPIP"); // ip
            String ftpPort = SysConfig.getPropertity("ZBFFTPPORT"); // port端口
            String ftpUserName = SysConfig.getPropertity("ZBFFTPUSERNAME"); // 用户名
            String ftpPassWord = SysConfig.getPropertity("ZBFFTPPASSWORD"); // 密码
            String ftpPath = SysConfig.getPropertity("ZBFFTPPATH");// ftp路径
            String localFilePath = SysConfig.getPropertity("RECONCILIATIONFILEPATH"); // 本地路径
    
            // 从sftp下载路径
            String path = ftpPath;
            FTPUtils sftp = new FTPUtils();
            try {
               // 链接sftp进行对账文件下载
                sftp.connect(ftpIP,ftpPort,ftpUserName,ftpPassWord);
                List<String> strings = sftp.batchDownLoadFile(path+date+"/", localFilePath+date+"/", "", ".txt", false);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                sftp.disconnect();
                response.flushBuffer();
            }
        }
    }

注意，一定要在springboot的启动类上加上servlet的扫描注解，不然调用会报错404，如下：

@SpringBootApplication
    @ServletComponentScan("com.apache.https.sinosoft.servlet")
    public class HttpsApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(HttpsApplication.class, args);
        }
    }

接下来，就是创建http调用类了，如下：

public void  uploadFileForZBF(String date){
            logger.info("uploadFileForZBF--->"+date);
            String dateString = date.replace("-","").replace("-","");
            String requestJSON = ""; // 请求JSON串
            String responseJSON = ""; // 返回JSON串
    
            try{
                // 调用http模块，链接sftp进行文件下载
                String reqParamater = "?date="+dateString;
                URL getUrl = new URL(ZBFUploadFileUrl + reqParamater);
                HttpURLConnection httpURLConnection = (HttpURLConnection) getUrl.openConnection();
                httpURLConnection.setRequestMethod("POST");
                byte[] bytes = requestJSON.getBytes("UTF-8");
    
                httpURLConnection.setRequestProperty("Content-Type","application/json");
                httpURLConnection.setRequestProperty("Charset","UTF-8");
    
                httpURLConnection.setUseCaches(false); // 请求不使用缓存
                httpURLConnection.setConnectTimeout(600000);// 链接超时时间
                httpURLConnection.setReadTimeout(600000);//设置从主机读取数据超时时间（毫秒）
                httpURLConnection.setDoInput(true);//设置是否从httpUrlConnection读入，默认情况下是true;指示应用程序要从URL连接读取数据
                httpURLConnection.setDoOutput(true);// 设置是否向httpUrlConnection输出// ）
    
                OutputStream outxml = httpURLConnection.getOutputStream();
                // 发送数据
                outxml.write(bytes, 0, bytes.length);
                outxml.flush();
                if(outxml !=null ){
                    outxml.close();
                }
                InputStream in = httpURLConnection.getInputStream();
                // 取返回值
                StringBuilder buffer = new StringBuilder();
                int k = 0;
                while (k != -1) {
                    k = in.read();
                    if (k != -1) {buffer.append((char) k);
                    }
                }
                responseJSON = new String(buffer.toString().getBytes("iso-8859-1"),"UTF-8");
                System.out.println("接收json串："+responseJSON);
                in.close();
            }catch (Exception e){
                e.printStackTrace();
            }
    
        }

我实现的是远程下载，大家也可以试试其他的调用实现。