1. 创建自己的bean文件：beans.xml
<?xml version="1.0" encoding="utf-8"?> <busi-beans> <beans> <bean id="syshelloimpl" type="com.cxm.test.syshello"> <desc>test</desc> <impl-class>com.cxm.test.syshelloimpl</impl-class> </bean> </beans> </busi-beans>
2. 提供解析xml类：xmlutils
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/**
*
*/
package com.cxm.xmlutil;
import java.io.inputstream;
import java.util.iterator;
import java.util.map;
import org.jdom.attribute;
import org.jdom.document;
import org.jdom.element;
import org.jdom.input.saxbuilder;
import org.jdom.xpath.xpath;
import com.cxm.beaninfo.beaninfo;
/**
* @author admin
*
*/
public class xmlutils
{
public static void parsexmldef(inputstream in, map<string,beaninfo> beandefmap,
stringbuffer sb) throws exception
{
saxbuilder reader = new saxbuilder(false);
document doc = null;
try
{
doc = reader.build(in);
iterator beanit = xpath.selectnodes(doc, "/busi-beans/beans/bean")
.iterator();
element e;
beaninfo beandef;
while (beanit.hasnext())
{
beandef = new beaninfo();
e = (element) beanit.next();
attribute attrid = e.getattribute("id");
attribute attrtype = e.getattribute("type");
attribute singletype = e.getattribute("single");
boolean issingle = true;
if(null != singletype&&"1".equals(singletype.getvalue())){
issingle= false;
}
beandef.setsingle(issingle);
beandef.setbeanid(attrid.getvalue());
beandef.settype(attrtype.getvalue());
beandef.setbeandesc(gettext(e, "desc"));
beandef.setimplclassname(gettext(e, "impl-class"));
//处理初始化参数
beandefmap.put(attrid.getvalue(), beandef);
}
}
catch (exception e)
{
e.printstacktrace();
}
}
/**
* 根据指定的element, xpath获取xml文档内容
*
* @param p_element
* @param p_xpath
* @return
* @throws exception
*/
public static string gettext(element p_element, string p_xpath)
throws exception {
string text = null;
element e=(element)xpath.selectsinglenode(p_element,p_xpath);
if (e != null) {
text = e.gettext();
} else {
}
return text;
}
}
3.定义bean io
/**
*
*/
package com.cxm.beaninfo;
/**
* @author admin
*
*/
public class beaninfo
{
private string beanid;
private string type;
private string beandesc;
public string getbeandesc()
{
return beandesc;
}
public void setbeandesc(string beandesc)
{
this.beandesc = beandesc;
}
public string gettype()
{
return type;
}
public void settype(string type)
{
this.type = type;
}
private string implclassname;
public string getbeanid()
{
return beanid;
}
public void setbeanid(string beanid)
{
this.beanid = beanid;
}
public string getimplclassname()
{
return implclassname;
}
public void setimplclassname(string implclassname)
{
this.implclassname = implclassname;
}
public boolean issingle()
{
return issingle;
}
public void setsingle(boolean issingle)
{
this.issingle = issingle;
}
private boolean issingle = true;
}
4.bean的创建类：beanutil
/**
*
*/
package com.cxm.bean;
/**
* @author admin
*
*/
public class beanutil
{
private static xmlbeanfactory factory = new xmlbeanfactory();
/**
* 获取定义好的bean对象
* @param p_beanid
* @return
* @throws exception
*/
public static object createbean(string p_beanid)
throws exception {
return factory.createbean(p_beanid);
}
}
/**
*
*/
package com.cxm.bean;
import java.io.filenotfoundexception;
import java.io.inputstream;
import java.lang.reflect.constructor;
import java.util.hashmap;
import java.util.map;
import com.cxm.beaninfo.beaninfo;
import com.cxm.exception.nosuchbeandefinitionexception;
import com.cxm.xmlutil.xmlutils;
/**
* @author admin
*
*/
public class xmlbeanfactory
{
private static string bean_xml = "/beans.xml";
private static map<string,beaninfo> beandefmap = new hashmap<string,beaninfo>();
private static map<string,object> instancemap = new hashmap<string,object>();
static {
inputstream in = xmlbeanfactory.class.getresourceasstream(bean_xml);
if(in ==null){
try{
throw new filenotfoundexception();
}catch (filenotfoundexception e){
e.printstacktrace();
}
}
stringbuffer sb = new stringbuffer();
try
{
xmlutils.parsexmldef(in, beandefmap, sb);
}
catch (exception e)
{
throw new runtimeexception();
}
}
public object createbean(string beanid) throws exception{
if(beanid==null || beanid.trim()==""){
throw new exception("beanid can not null or '' ");
}
beaninfo beaninfo = beandefmap.get(beanid);
if(null ==beaninfo ){
throw new nosuchbeandefinitionexception(" beanid is not define in xml");
}
object instance;
if(beaninfo.issingle()){
instance =instancemap.get(beanid);
if(null != instance){
return instance;
}
}
string implclass = beaninfo.getimplclassname();
constructor<?> constructor = class.forname(implclass.trim()).getconstructor();
instance = constructor.newinstance();
if(beaninfo.issingle()){
instancemap.put(beanid, instance);
}
return instance;
}
}
5. 测试：
/**
*
*/
package com.cxm.test;
/**
* @author admin
*
*/
public interface syshello
{
void syshello();
}
/**
*
*/
package com.cxm.test;
/**
* @author admin
*
*/
public class syshelloimpl implements syshello
{
@override
public void syshello()
{
system.out.println("hello world!");
}
}
/**
*
*/
package com.cxm.test;
import com.cxm.bean.beanutil;
/**
* @author admin
*
*/
public class test
{
/**
* @param args
* @throws exception
*/
public static void main(string[] args) throws exception
{
syshello s = (syshello)beanutil.createbean("syshelloimpl");
s.syshello();
}
}
以上这篇java实现spring在xml配置java类的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持移动技术网。
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