SSM

SSM

錯誤

第一個:
Mapper method 'com.zwt.springmvc.crud.Dao.EmployeeDao.DeleteId' has an unsupported return type: class com.zwt.springmvc.crud.entities.Employee

解決:html

delete, update, insert等操做單時候,dao層返回爲int類型java

Employee DeleteId(Integer id); 
應改成
int DeleteId(Integer id);

delete操做返回intmysql

第二個:
The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

解決:spring

頁面輸入數據的時候格式不正確sql

salary :1.222.333.1 改成#,###,###.#
第三個:

問題mvc

刪除完成返回時出現:app

頁面顯示redirect:/epms,卻並不跳轉jsp

解決:ide

去掉@ResponseBody註解spa

第四個:

問題:

Request method 'PUT' not supported

解決:

@RequestMapping(value="/emp/{id}", method=RequestMethod.POST)
public String update(Employee employee,Map<String, Object> map){    
    map.put("employee", employee);    
    employeeDao.update(employee);    
    System.out.println("update success");    
    return "redirect:/epms";
}

將上方代碼改成以下:

@RequestMapping(value = "/emp", method = RequestMethod.PUT)
public String update(Employee employee){   
    employeeDao.update(employee);    
    System.out.println("Success" +employee);    
    return "redirect:/epms";
}
第五個:

問題

check the manual that corresponds to your MySQL server version for the right syntax to use near '= '111@qq.com', gender = null, department = '镨镨2',salary = nullwhere i' at line 1

彷佛sql寫錯了

UPDATE employee SETemail = #{email}, gender = #{gender}, department = #{department},salary = #{salary}where id = #{id}

解決:

在SET後添加空格

第六個:

問題:

前段頁面顯示中文亂碼

解決:

jsp頁面中加入

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
第七個:

錯誤:

Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: javax.validation.BootstrapConfiguration.getClockProviderClassName()Ljava/lang/String;  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.

解決:

緣由是導入的依賴於Mybatis衝突

刪除下方依賴便可

<!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator --><dependency>  
    <groupId>org.hibernate.validator</groupId>  
    <artifactId>hibernate-validator</artifactId>  
    <version>6.0.16.Final</version>
</dependency>
第八個:

問題:

Tomcat關閉時報錯

 Web應用程序 [ROOT] 註冊了JDBC驅動程序 [com.mysql.jdbc.Driver],但在Web應用程序中止時沒法註銷它。 爲防止內存泄漏,JDBC驅動程序已被強制取消註冊。

解決:

未解決

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