WebPdf.java

package com.example.expense.expensereport.web.servlet;

import java.io.File;
import java.io.IOException;

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

import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import DBstep.iMsgServer2000;

import com.example.expense.entity.ExpenseReport;
import com.example.expense.expensereport.service.ExpenseReportManager;
import com.norteksoft.product.util.ContextUtils;

public class WebPdf extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static final String METHOD_POST = "post";
	private static final String LOAD_FILE = "LOADFILE";
	private Log log = LogFactory.getLog(getClass());
	
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		DBstep.iMsgServer2000 msgServer = new DBstep.iMsgServer2000();
		try {
			if(METHOD_POST.equalsIgnoreCase(request.getMethod())) {
				msgServer.Load(request);
				processInfo(msgServer);
			}else{
				addErrorMsg(msgServer, "请使用Post方法");
			}
		} catch (Exception e) {
			log.debug(e);
			addErrorMsg(msgServer, "文件打开错误, 请联系管理员.");
		}
		msgServer.Send(response);
	}
	
	private void processInfo(iMsgServer2000 msgServer) throws IOException {
		if ("DBSTEP".equalsIgnoreCase(msgServer.GetMsgByName("DBSTEP"))) { // 如果是合法的信息包
			Long recordId = Long.parseLong(msgServer.GetMsgByName("RECORDID"));
			String optionMessage = msgServer.GetMsgByName("OPTION");
			if (LOAD_FILE.equalsIgnoreCase(optionMessage)) { // 查看文件
				msgServer.MsgTextClear();
				msgServer.MsgFileBody(loadFile(recordId)); // 将文件信息打包
				msgServer.SetMsgByName("STATUS", "打开成功!"); // 设置状态信息
				msgServer.MsgError("");   // 清除错误信息
			}
		}else{
			addErrorMsg(msgServer, "客户端发送数据包错误!");
		}
	}
	
	private byte[] loadFile(Long recordId) throws IOException{
		ExpenseReportManager expenseReportManager = (ExpenseReportManager) ContextUtils.getBean("expenseReportManager");
		ExpenseReport expenseReport = expenseReportManager.getExpenseReport(recordId);
			return FileUtils.readFileToByteArray(new File(expenseReport.getFilePath()));
	}

	private void addErrorMsg(DBstep.iMsgServer2000 msgServer, String msg){
		msgServer.MsgError(msg);
		msgServer.MsgTextClear();
		msgServer.MsgFileClear();
	}
}