因为单位用的是servlet+jsp+jdbc 放下SSM框架很久了，怕以后没有突破所以拿起SSM简单练练手，发现确实生疏了不少，废话不多说，直奔主题，由于原先使用的是表单submit同步提交，对于用户体验来说确实不好，于是乎想练练ajax实现异步传输
首先是web.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>Archetype Created Web Application</display-name> <!-- 中文乱码解析器 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 上下文监听 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- The front controller of this Spring Web application, responsible for handling all application requests --> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </init-param> </servlet> <!-- Map all requests to the DispatcherServlet for handling --> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
其次是pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>ssm</groupId> <artifactId>ssm</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>ssm Maven Webapp</name> <properties> <!-- spring版本号 --> <spring.version>4.0.2.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.2.6</mybatis.version> <!-- log4j日志文件管理包版本 --> <slf4j.version>1.7.7</slf4j.version> <log4j.version>1.2.17</log4j.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <!-- 表示开发的时候引入，发布的时候不会加载此包 --> <scope>test</scope> </dependency> <!-- spring核心包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- mybatis核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- mybatis/spring包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- 导入java ee jar 包 --> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency> <!-- 导入Mysql数据库链接jar包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.30</version> </dependency> <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.2.2</version> </dependency> <!-- JSTL标签类 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- 日志文件管理包 --> <!-- log start --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <!-- 格式化对象，方便输出日志 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.1.41</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!-- log end --> <!-- 映入JSON --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency>
<!-- 这里是前后台传递json需要的jar包 -->
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.8</version> </dependency> <!-- 上传组件包 --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.9</version> </dependency> </dependencies> <!-- 这边是由于当时死活无法找到dao层接口映射的方法而添加的，如果出现没办法找到dao层的方法可以用这个配置看看-->
<build> <finalName>ssm</finalName> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build> </project>
再来是applicationcontext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:c="http://www.springframework.org/schema/c" xmlns:cache="http://www.springframework.org/schema/cache" xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- 注解扫描 --> <context:component-scan base-package="bus.*"/> <!-- 驱动 --> <tx:annotation-driven transaction-manager="transactionManager"/> <!-- basicDataSource --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/inputsystem" /> <property name="username" value="root"/> <property name="password" value="root"/> </bean> <!-- SqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 事物处理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 试图解析 --> <bean id="resourceView" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/"/> <property name="suffix" value=".jsp"/> </bean> <!-- mapper扫描 --> <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="bus.dao"/> </bean> </beans>
问题来了如果前台是用ajax传json的话，ajax可以这么写，因为获取的“sid”数据是一个变量，而且这边遇到一个坑,如果编码不转的话会出现前台传id="";到后台之后可能会变成id=%20%20,这个%20%20就是双引号的编码，所以这边需要做编码的转换
<%@ page contentType="text/html;charset=UTF-8" language="java"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <html> <head> <script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"></script> <script type="text/javascript"> var $tb; $(document).ready(function(){
$tb=$("#tb1");
$("#search").click(function(){
alert($("#sid").val());
var id={"id":$("#sid").val()};
alert(id);
$.ajax({ "url":"findbysid", "type":"post", "data":JSON.stringify(id), "datatype":"json", "contentType" : "application/json;charset=utf-8", "success":function getPage(jsonArray){ html=""; var jsonarray= $.parseJSON(jsonArray); for (var i = 0; i < jsonarray.length; i++) { $("<tr><td>"+jsonarray[i].id+"</td><td>"+jsonarray[i].userName+"</td><td>"+jsonarray[i].passWord+"</td></tr>").appendTo($tb) } } }) }) }) </script> </head> <body> <div style="margin-top: 25px"> 请输入所要查询的学号:<input type="text" id="sid" name="sid" /> <input id="search" style="margin-left: 10px" type="button" value="搜索"><br /> </div> <div style="margin-top: 50px"> <table border="1"> <thead> <tr> <td>id</td> <td>用户</td> <td>密码</td> </tr> </thead> <tbody id="tb1"> </tbody> <div id="conten"></div> </table> </div> </body> </html>
正题来了，当json返回的时候本人呵呵哒的直接return 了一个JSONARRAY，结果可想而知前台没反应，F12出现406的错误，果断百度，可还是没法解决，没办法只能静下心来好好思考一下，哎！！！问题的关键就是响应头里面的content-type:text/html;charset=utf-8，我看网上有解释和html有关的，又说和@responsebody有关的，确实不同的问题不同的解决办法，我考虑了一下TEXT文本类型，我穿的是JSONARRAY，总感觉好像哪里不妥，感觉任何事情都要尝试，于是乎直接把JSONARRAY有转成了String类型，后台返回也返回了String类型，这样就能和content-type:text/html;charset=utf-8，同样也解决了406这个问题，当然也可能是很长时间没有写了，这块代码确实丢了不少，看来以后还是需要多多练习。如果@responsebody 要求返回的是JONSOBJECT的话，额还没尝试，回头玩玩看。
当然在练习的过程中也出现了415，我出现这个问题是因为缺少了json的相关jar包（一共3个，这个可以随意百度，都有解决方法）导致传输的内容无法识别，在maven中配置好相关的json就可以解决了，具体可以看我maven中对json那块的配置。
第一次写，也是给自己做一个笔记，希望后面遇到同样的问题不要在花1个小时去解决，同时希望遇到类似问题的童鞋，也可以快速的解决，太TM浪费时间了。