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Spring MVC中使用errors标签

2018-10-16 16:18 369 查看

先创建一个实体类，后续的验证都基于这个实体类：

public class Goods {

private String goodsName;
private String city;
private int amount;

public String getGoodsName() {
return goodsName;
}
public void setGoodsName(String goodsName) {
this.goodsName = goodsName;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}

}

表单页面的controller方法：

@RequestMapping("/test1")
public String test1(Model model) {
Goods goods = new Goods();
goods.setGoodsName("联想电脑");
goods.setCity("北京");
goods.setAmount(10);
model.addAttribute("goods",goods);

return "/test1";
}

表单jsp页面

test1.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>test1</title>
</head>
<body>
<form:form modelAttribute="goods" method="post" action="test2">
<form:input path="goodsName" />
<form:errors path="goodsName"></form:errors>
<br />
<c:set var="citys" value="北京,上海,广州" />
<c:set var="cityList" value="${fn:split(citys,',') }" />
<form:select path="city">
<form:option value="">请选择</form:option>
<form:options items="${cityList }" />
</form:select>
<form:errors path="city"></form:errors>
<br />
<form:button>提交</form:button>
</form:form>
</body>
</html>

提交表单的controller：

@InitBinder
public void initBinder(DataBinder binder) {
binder.setValidator(new Validator() {

@Override
public void validate(Object target, Errors errors) {
ValidationUtils.rejectIfEmpty(errors, "goodsName", null, "商品名称不能为空");
ValidationUtils.rejectIfEmpty(errors, "city", null, "城市不能为空");

Goods goods = (Goods) target;
if(goods.getGoodsName().length()<4) {
errors.rejectValue("goodsName", null, "商品名称不能少于4个字符");
}
}

@Override
public boolean supports(Class<?> clazz) {

return Goods.class.equals(clazz);
}
});
}

@RequestMapping(value="/test2",method=RequestMethod.POST)
public String test2(@Validated Goods goods,Errors errors,BindingResult result) {
if(errors.hasErrors()) {
return "/test1";
} else {
return "/test2";
}
}

通过@InitBinder注解的方法，会在test2方法前执行，如果检查出了错误，会在test2方法里通过errors.hasErrors()方法判断

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