JSON-2 (从后台到前面的流程)

1.新建一个ActionServlet类,并继承HttpServlet

2.  //获得请求资源路径

//http://ip:port/ajax-day01/check.do
		String uri=
				request.getRequestURI();

3.//分析请求资源路径

String action=
				uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));

4.写出响应格式,并得到 响应输出流out对象类型是PrinterWrite:

response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();

5//依据不同的结果做不同的处理

//依据分析的结果,进行不同的处理
		if("/quoto".equals(action)) {
			//模拟生成几只股票的信息
			/*
			 * 多个对象组成的数组或者集合
			 * 转换成json字条串。
			 */
			
				List<Stock>stocks=
						new ArrayList<Stock>();
				Random r=new Random();
				for(int i=0;i<3;i++) {
					Stock s=new Stock();
					s.setCode("8098"+r.nextInt(10));
					s.setName("中国平安"+r.nextInt(10));
					s.setPrice(r.nextInt(1000));
					stocks.add(s);
					
				}
				JSONArray jsonArr=
						JSONArray.fromObject(stocks);
				String jsonStr=
						jsonArr.toString();
				System.out.println(jsonStr);
				
				//发送给浏览器(回应给浏览器)
				out.println(jsonStr);
public class Stock {
	private String code;
	private String name;
	private int price;}   //Stock实体类,省略get 和set方法

6.配置servlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 
 <servlet>
 	<servlet-name>action</servlet-name>
 	<servlet-class>web.ActionSerlvet</servlet-class>
 </servlet>
 <servlet-mapping>
 	<servlet-name>action</servlet-name>
 	<url-pattern>*.do</url-pattern>
 </servlet-mapping>
  
  
</web-app>

7.测试

http://localhost:8888/ajax-day0002-json/quoto.do

浏览器输出:

[{"code":"80986","name":"中国平安1","price":886},{"code":"80985","name":"中国平安9","price":313},{"code":"80985","name":"中国平安3","price":693}]


jq - commandline JSON processor [version 1.6] Usage: jq-linux64 [options] <jq filter> [file...] jq-linux64 [options] --args <jq filter> [strings...] jq-linux64 [options] --jsonargs <jq filter> [JSON_TEXTS...] jq is a tool for processing JSON inputs, applying the given filter to its JSON text inputs and producing the filter's results as JSON on standard output. The simplest filter is ., which copies jq's input to its output unmodified (except for formatting, but note that IEEE754 is used for number representation internally, with all that that implies). For more advanced filters see the jq(1) manpage ("man jq") and/or https://stedolan.github.io/jq Example: $ echo '{"foo": 0}' | jq . { "foo": 0 } Some of the options include: -c compact instead of pretty-printed output; -n use `null` as the single input value; -e set the exit status code based on the output; -s read (slurp) all inputs into an array; apply filter to it; -r output raw strings, not JSON texts; -R read raw strings, not JSON texts; -C colorize JSON; -M monochrome (don't colorize JSON); -S sort keys of objects on output; --tab use tabs for indentation; --arg a v set variable $a to value <v>; --argjson a v set variable $a to JSON value <v>; --slurpfile a f set variable $a to an array of JSON texts read from <f>; --rawfile a f set variable $a to a string consisting of the contents of <f>; --args remaining arguments are string arguments, not files; --jsonargs remaining arguments are JSON arguments, not files; -- terminates argument processing;
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