我是JEE的新手。我想在jsp declarion标签中创建json数据可以帮助我。
这是我的源代码
<%!
public double getTax(String name, double amt, double dis) {
double total = 0.0;
HashMap<String, Double> hm = new HashMap<String, Double>();
PreparedStatement ps = DBConnection.getPrepare("select value,op,wit,formula,"
+" taxtype from tax where name=?");
try {
System.out.println("Discount:" + dis);
ps.setString(1, name);
ResultSet rs = ps.executeQuery();
String form = "sub-discount";
System.out.println("----------------Tax Value Details-------------------");
JSONObject json1 = new JSONObject();
JSONArray jarr = new JSONArray();
while (rs.next()) {
JSONObject o = new JSONObject();
double val = rs.getDouble(1);
String op = rs.getString(2);
String wit = rs.getString(3);
form = rs.getString(4);
String type = rs.getString(5);
o.put("val", val);
double sub = 0.0;
if (wit.equalsIgnoreCase("sub-discount")) {
sub = amt - dis;
} else {
sub = hm.get(wit);
}
if (op.equals("%")) {
sub = (val / 100) * sub;
hm.put(op, val);
} else if (op.equals("*")) {
sub = val * sub;
} else {
sub += val;
}
hm.put(type, sub);
System.out.println("Tax Type:" + type + "; Tax Amount:" + sub);
System.out.println("operator:" + op + "; Tax value:" + val);
}
String s[] = form.split(";");
for (int i = 1; i < s.length; i++) {
total += hm.get(s[i]);
}
} catch (Exception e) {
}
return total;
}
它显示登录Apache tomcat
Discount:0.0
----------------------Tax Value Details--------------------------------
Tax Type:Vat; Tax Amount:15.200000000000001
operator:%; Tax value:4.0
Tax Type:Stax; Tax Amount:19.0
operator:%; Tax value:5.0
Tax Type:Scharge; Tax Amount:22.8
operator:%; Tax value:6.0
Tax Type:cst; Tax Amount:19.0
operator:%; Tax value:5.0
此数据从MYSQL数据库中的多个表中收集。
答案 0 :(得分：0)
您可以使用类似的代码（我只是为JSON数组创建指定所需的代码）：
JSONObject json1=null;
JSONArray jarr=new JSONArray();
while(rs.next()){
json1 = new JSONObject();
json1.put("val", val));
json1.put("op", op);
json1.put("wit", wit);
jarr.put(json1);
}
答案 1 :(得分：0)
<%--
Document : DataForTab
Created on : Jul 27, 2014, 1:50:34 PM
Author : Anil Reddy
--%>
<%@page import="java.util.ArrayList"%>
<%@page import="org.apache.log4j.Logger"%>
<%@page import="com.action.accounts.Accounts"%>
<%@page import="java.util.logging.Level"%>
<%@page import="java.sql.SQLException"%>
<%@page import="java.util.HashMap"%>
<%@page import="net.sf.json.JSONArray"%>
<%@page import="net.sf.json.JSONObject"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="com.util.DBConnection"%>
<%
// start items list from order on a table
String id=request.getParameter("id");
PreparedStatement ps=DBConnection.getPrepare("select i.id,item,quantity,o.total,tax from orders o,items i where item=name and tableid="+id);
PreparedStatement ps1=DBConnection.getPrepare("select i.id,item,quantity,o.total,tax from orders o,items i where item=name and tableid="+id);
PreparedStatement ps2=DBConnection.getPrepare("select i.id,item,quantity,o.total,ptax from orders o,items i where item=name and tableid="+id);
PreparedStatement ps3=DBConnection.getPrepare("select i.id,item,quantity,o.total,taketax from orders o,items i where item=name and tableid="+id);
ps=DBConnection.getPrepare("select assign from tables where tid="+id);
ResultSet rs1=ps.executeQuery();
String type1="Dinning";
JSONObject json=new JSONObject();
if(rs1.next())
type1=rs1.getString(1);
if(type1.equalsIgnoreCase("dinning")){
ResultSet rs=ps1.executeQuery();
JSONObject json1=new JSONObject();
JSONArray jarr=new JSONArray();
while(rs.next()){
json1.put("id", rs.getString(1));
json1.put("name", rs.getString(2));
json1.put("quantity",rs.getString(3));
json1.put("price", rs.getString(4));
json1.put("Dinning tax",rs.getString(5));
jarr.add(json1);
}
json.put("items", jarr);
} else if(type1.equalsIgnoreCase("parcel")){
ResultSet rs=ps2.executeQuery();
JSONObject json1=new JSONObject();
JSONArray jarr=new JSONArray();
while(rs.next()){
json1.put("id", rs.getString(1));
json1.put("name", rs.getString(2));
json1.put("quantity",rs.getString(3));
json1.put("price", rs.getString(4));
json1.put("Parcel tax",rs.getString(5));
jarr.add(json1);
}
json.put("items", jarr);
}else {
ResultSet rs=ps3.executeQuery();
JSONObject json1=new JSONObject();
JSONArray jarr=new JSONArray();
while(rs.next()){
json1.put("id", rs.getString(1));
json1.put("name", rs.getString(2));
json1.put("quantity",rs.getString(3));
json1.put("price", rs.getString(4));
json1.put("Take Away tax",rs.getString(5));
jarr.add(json1);
}
json.put("items", jarr);
}
ps=DBConnection.getPrepare("select assign from tables where tid="+id);
ResultSet rs=ps.executeQuery();
String type="Dinning";
if(rs.next())
type=rs.getString(1);
String sql="";
String sql1="select distinct(tax) from orders o,items i where item=name and tableid=?";
String sql2="";
if(type.equalsIgnoreCase("dinning")){
sql="select tax,sum(total) from orders o,items i where tableid=? and name=item group by tax";
sql1="select distinct(tax) from orders o,items i where item=name and tableid=?";
sql2="select value,op,wit,formula,taxtype from tax";
}
else if(type.equalsIgnoreCase("parcel")){
sql="select ptax,sum(total) from orders o,items i where tableid=? and name=item group by ptax";
sql1="select distinct(ptax) from orders o,items i where item=name and tableid=?";
sql2="select value,op,wit,formula,taxtype from tax";
}
else{
sql="select taketax,sum(total) from orders o,items i where tableid=? and name=item group by taketax";
sql1="select distinct(taketax) from orders o,items i where item=name and tableid=?";
sql2="select value,op,wit,formula,taxtype from tax where name=?";
}
ps=DBConnection.getPrepare(sql);
ps.setString(1,id);
rs=ps.executeQuery();
JSONObject jarr1=new JSONObject();
double sub=0.0,tax=0.0,total=0.0,disco=0.0,val=0.0,list=0.0;
String form;
ArrayList list1;
while(rs.next()){
double value=rs.getDouble(2);
sub+=value;
// String ttype=rs.getString(3);
// String n="";
String taxname=rs.getString(1);
String n="0";
double discount=Double.parseDouble(n);
disco+=discount;
total+=getTax(taxname,value,discount);
list1=getTaxAmount(id);
}
json.put("subtotal", sub);
json.put("tax type",type);
json.put("tax",total);
json.put("discount",disco);
json.put("GrandTotal",sub+total-disco);
//end of totals
//start payments
ps=DBConnection.getPrepare("select name from payment");
rs=ps.executeQuery();
JSONObject obj1=new JSONObject();
JSONArray arr=new JSONArray();
while(rs.next()){
obj1.put("types",rs.getString(1) );
arr.add(obj1);
}
json.put("payments",arr);
//end of payments
//tax types
ps=DBConnection.getPrepare(sql1);
ps.setString(1,id);
rs=ps.executeQuery();
JSONArray arr2=new JSONArray();
while(rs.next()){
JSONObject ob=new JSONObject();
ob.put("type", rs.getString(1));
arr2.add(ob);
}
json.put("tax types",arr2);
//end if tax types
response.setContentType("application/json");
response.getWriter().write(json.toString());
%>
<%!
public double getTax(String name,double amt,double dis){
double total=0.0;
HashMap<String,Double> hm=new HashMap<String,Double>();
PreparedStatement ps=DBConnection.getPrepare("select value,op,wit,formula,taxtype from tax where name=?");
try{
System.out.println("Discount:"+dis);
ps.setString(1, name);
ResultSet rs=ps.executeQuery();
String form="sub-discount";
System.out.println("----------------------Tax Value Details--------------------------------");
JSONObject json1=new JSONObject();
JSONArray jarr=new JSONArray();
while(rs.next()){
double val=rs.getDouble(1);
String op=rs.getString(2);
String wit=rs.getString(3);
form=rs.getString(4);
String type=rs.getString(5);
double sub=0.0;
if(wit.equalsIgnoreCase("sub-discount"))
sub=amt-dis;
else
sub=hm.get(wit);
if(op.equals("%")){
sub=(val/100)*sub;
hm.put(op,val);
}
else if(op.equals("*"))
sub=val*sub;
else
sub+=val;
hm.put(type,sub);
System.out.println("Tax Type:"+type+"; Tax Amount:"+sub);
System.out.println("operator:"+op+"; Tax value:"+val);
}
System.out.println(jarr.toString(5));
System.out.println(jarr.toString(1));
System.out.println(jarr.toString(2));
System.out.println(jarr.toString());
String s[]=form.split(";");
for(int i=1;i<s.length;i++){
total+=hm.get(s[i]);
}
}catch(Exception e){}
return total;
}
%>
<%!
public static ArrayList<Double> getTaxAmount(String id){
int tax=0;
String t="";
ArrayList<Double> list=new ArrayList<Double>();
PreparedStatement ps=DBConnection.getPrepare("select tax from items where name='"+id+"'");
try {
ResultSet rs=ps.executeQuery();
if(rs.next())
t=rs.getString(1);
if(t==null){
System.out.println("No tax is set");
list.add(0.0);list.add(0.0);
}
System.out.println("TAxdetails:"+t+"Table id:"+id);
ps=DBConnection.getPrepare("select value from tax where name='"+t+"'");
rs=ps.executeQuery();
while(rs.next()){
list.add(rs.getDouble(1));
System.out.println(rs.getDouble(1));
}
} catch (SQLException ex) {
// Logger.getLogger(Accounts.class.getName()).log(Level.SEVERE, null, ex);
}
return list;
}
%>