Spring MVC 重定向传输数据

野性酷女 2022-04-13 08:49 204阅读 0赞

# Spring MVC 重定向 传输数据 #

## URL方式 ##

### 原理 ###

将数据放到URL上，只能放普通类型数据，无法复制对象

### 代码 ###

import org.springframework.stereotype.Component;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @Component
    @RequestMapping("/url")
    public class Url {
    	@RequestMapping(value = "/first", method = RequestMethod.GET)
    	public String first(Model model) {
    		model.addAttribute("name", "mxh");
    		return "redirect:/url/second";
    	}
    
    	@RequestMapping(value = "/second", method = RequestMethod.GET)
    	@ResponseBody
    	public String second(@RequestParam String name) {
    		return name;
    	}
    }

### 效果图 ###

浏览器访问：…/url/first

![kmDOKIE.png][]

## Flash 方式 ##

### 原理 ###

对话数据可以跨请求保存

数据的流动：request -> session -> request

### 代码 ###

public class People {
    	private String name;
    
    	public People(String name) {
    		this.name = name;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    }

--------------------

import org.springframework.stereotype.Component;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.servlet.mvc.support.RedirectAttributes;
    
    @Component
    @RequestMapping("/flash")
    public class Flash {
    	@RequestMapping(value = "/first", method = RequestMethod.GET)
    	public String first(RedirectAttributes model) {
    		model.addFlashAttribute("people", new People("mxh"));
    		return "redirect:/flash/second";
    	}
    
    	@RequestMapping(value = "/second", method = RequestMethod.GET)
    	@ResponseBody
    	public String second(@ModelAttribute People people) {
    		return people.getName();
    	}
    }

### 效果图 ###

浏览器访问：…/flash/first

![gkJdeRz.png][]

[kmDOKIE.png]: https://i.imgur.com/kmDOKIE.png
[gkJdeRz.png]: https://i.imgur.com/gkJdeRz.png