这两天在学习一个分布式的项目--淘淘商城,使用了Alibaba的dubbo作为通信工具,zookeeper作为register,由于dubbo是基于socket协议的,所以在进行pojo传输的时候报了异常,因为pojo没有实现序列化接口,就无法进行基于二进制的序列化传输。报错如下:
但是很麻烦的一件事是如果逆向工程生成的pojo全部自己实现序列化会很麻烦,所以看了一下mybatis的插件,发现有一个可以自动给所有pojo实现序列化接口和序列化版本id(example除外)。
如果生成的pojo能够有toString()的重写会给开发、调试带来很大的方便,所以我们也将生成的pojo重写toString()方法。
方法如下:
逆向工程配置文件generatorConfig.xml代码如下:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="testTables" targetRuntime="MyBatis3">
<!-- 配置生成pojo的序列化的插件,mybatis支持很多插件,这些插件都在 org.mybatis.generator.plugins包下 -->
<plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
<!-- 配置生成pojo的toString()方法的插件,mybatis支持很多插件,这些插件都在 org.mybatis.generator.plugins包下 -->
<plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
<commentGenerator>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--数据库连接的信息:驱动类、连接地址、用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/taotao" userId="root" password="root">
</jdbcConnection>
<!-- 默认false时,把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer
当为 true时,把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- targetProject:生成PO类的位置 -->
<javaModelGenerator targetPackage="com.taotao.pojo" targetProject=".src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
<!-- 从数据库返回的值被清理前后的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.taotao.mapper" targetProject=".src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<!-- targetPackage:mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.taotao.mapper" targetProject=".src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<!-- 指定数据库表 -->
<table schema="" tableName="tb_content"></table>
<table schema="" tableName="tb_content_category"></table>
<table schema="" tableName="tb_item"></table>
<table schema="" tableName="tb_item_cat"></table>
<table schema="" tableName="tb_item_desc"></table>
<table schema="" tableName="tb_item_param"></table>
<table schema="" tableName="tb_item_param_item"></table>
<table schema="" tableName="tb_order"></table>
<table schema="" tableName="tb_order_item"></table>
<table schema="" tableName="tb_order_shipping"></table>
<table schema="" tableName="tb_user"></table>
</context>
</generatorConfiguration>
java代码如下:
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;
public class GeneratorSqlmap {
public void generator() throws Exception {
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
// 指定逆向工程配置文件
File configFile = new File("generatorConfig.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
myBatisGenerator.generate(null);
}
public static void main(String[] args) throws Exception {
try {
GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
generatorSqlmap.generator();
} catch (Exception e) {
e.printStackTrace();
}
}
}
生成的pojo类如下:(仅以TBItem为例)
package com.taotao.pojo;
import java.io.Serializable;
import java.util.Date;
public class TbItem implements Serializable {
private Long id;
private String title;
private String sellPoint;
private Long price;
private Integer num;
private String barcode;
private String image;
private Long cid;
private Byte status;
private Date created;
private Date updated;
private static final long serialVersionUID = 1L;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title == null ? null : title.trim();
}
public String getSellPoint() {
return sellPoint;
}
public void setSellPoint(String sellPoint) {
this.sellPoint = sellPoint == null ? null : sellPoint.trim();
}
public Long getPrice() {
return price;
}
public void setPrice(Long price) {
this.price = price;
}
public Integer getNum() {
return num;
}
public void setNum(Integer num) {
this.num = num;
}
public String getBarcode() {
return barcode;
}
public void setBarcode(String barcode) {
this.barcode = barcode == null ? null : barcode.trim();
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image == null ? null : image.trim();
}
public Long getCid() {
return cid;
}
public void setCid(Long cid) {
this.cid = cid;
}
public Byte getStatus() {
return status;
}
public void setStatus(Byte status) {
this.status = status;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public Date getUpdated() {
return updated;
}
public void setUpdated(Date updated) {
this.updated = updated;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(getClass().getSimpleName());
sb.append(" [");
sb.append("Hash = ").append(hashCode());
sb.append(", id=").append(id);
sb.append(", title=").append(title);
sb.append(", sellPoint=").append(sellPoint);
sb.append(", price=").append(price);
sb.append(", num=").append(num);
sb.append(", barcode=").append(barcode);
sb.append(", image=").append(image);
sb.append(", cid=").append(cid);
sb.append(", status=").append(status);
sb.append(", created=").append(created);
sb.append(", updated=").append(updated);
sb.append(", serialVersionUID=").append(serialVersionUID);
sb.append("]");
return sb.toString();
}
}
所需要的jar包如下:
所需要的数据库表如下:
参考链接: