Java session储存

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本文介绍了一种使用Java Session在服务器端存储和读取数据的方法，具体展示了如何将购药信息存入Session并从Session中读取，以及如何通过List显示这些数据。

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                                  Java session储存

开发工具与关键技术：java
作者：彭浩达
撰写时间：2019年 6月 14日

public void Selectzbruku(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
response.setCharacterEncoding(“utf-8”);
HttpSession session = request.getSession();
int totalRows = 0;
//读取zbruku 存进session的数据
List list = (List) session.getAttribute(“zbruku”);
if(list != null){
totalRows = list.size();
}
LayuiTableData layuiTableData=new LayuiTableData();
layuiTableData.setCount(totalRows);
layuiTableData.setData(list);

JSONObject jsonObject = JSONObject.fromObject(layuiTableData);
PrintWriter out=response.getWriter();
out.write(jsonObject.toString());
System.out.println(jsonObject.toString());
out.flush();
out.close();
}
//把数据存进 zbruku
public void Chasession(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException, ParseException{
int purchaseid = Integer.parseInt(request.getParameter(“purchaseid”));
BigDecimal quantity = new BigDecimal(request.getParameter(“quantity”));
String invoice = request.getParameter(“invoice”);
String dealsite = request.getParameter(“dealsite”);
String drugname = request.getParameter(“drugname”);
String unit = request.getParameter(“unit”);
BigDecimal costprice = new BigDecimal(request.getParameter(“costprice”));
BigDecimal retailprice = new BigDecimal(request.getParameter(“retailprice”));
String countryzi = request.getParameter(“countryzi”);
String batchnumber = request.getParameter(“batchnumber”);
String number = request.getParameter(“number”);
BigDecimal lingshou = quantity.multiply(retailprice);
BigDecimal chengbei = quantity.multiply(costprice);

PurDrugMed drugMed = new PurDrugMed();
drugMed.setLingshouz(lingshou);
drugMed.setChengbeiz(chengbei);
drugMed.setNumber(number);
drugMed.setDealsite(dealsite);
drugMed.setCountryzi(countryzi);
drugMed.setDrugname(drugname);
drugMed.setUnit(unit);
drugMed.setCostprice(costprice);
drugMed.setRetailprice(retailprice);
drugMed.setPurchaseid(Integer.valueOf(purchaseid));
drugMed.setQuantity(quantity);
drugMed.setBatchnumber(batchnumber);
drugMed.setInvoice(invoice);
List drugMeds= null;
drugMeds = new ArrayList();
drugMed.setJiaShijan(effectivedate);
drugMeds.add(drugMed);

HttpSession session = request.getSession();
session.setAttribute(“zbruku”, drugMeds); //要返回List表数据显示记得先把数据转成List，再进行储存，否则用List list = (List) session.getAttribute(“zbruku”);读取不了的
}

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