Ognl.getValue("OGNL 表达式 ",context,root)
Ognl.getValue("OGNL 表达式",context);
Ognl.getValue("OGNL 表达式",root);Ognl.setValue("OGNL 表达式 ",context,root,value)
Ognl.setValue("OGNL 表达式",context,value);
Ognl.setValue("OGNL 表达式",root,value);

package cn.ongl.test;public class User {private int id;private String userName;private String userPassword;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPassword() {return userPassword;}public void setUserPassword(String userPassword) {this.userPassword = userPassword;}}

User.java

    @Testpublic void testName() throws OgnlException{User user=new User();user.setId(1);user.setUserName("jame");user.setUserPassword("123456");Object root=user;Map<String,Object> context=new HashMap<String,Object>();context.put("userName","brace");//设置为userName，表示将root中userName属性值设置为lucyOgnl.setValue("userName",context,root, "lucy");//从root中获取userName字段的值String uname= (String)Ognl.getValue("userName",context,root);System.out.println(uname);//lucy//从context中获取userName的值uname=(String)Ognl.getValue("#userName", context, root);System.out.println(uname);//brace//设置为#userName,表示将context中userName属性值设置stevenOgnl.setValue("userName",context,"steven");//从root中获取userName属性字段的值uname=(String)Ognl.getValue("userName", context, root);System.out.println(uname);//lucy//从context中获取userName字段的值uname=(String)Ognl.getValue("#userName", context,root);System.out.println(uname);//steven}

        Enumeration<String> parameterNames = request.getParameterNames();//将所有的参数和值封装到parameter中去Map<String,String> parameters = new HashMap<String,String>();String value;String nextElement;/** 循环遍历，将请求的参数以key-value的形式封装到Map集合 */while(parameterNames.hasMoreElements()){nextElement = parameterNames.nextElement();value=request.getParameter(nextElement);parameters.put(nextElement, value);}//循环访问请求参数，给Action对象中同名的属性赋值User root = new User();Set<String> keys = parameters.keySet();for(String key:keys){try {Ognl.setValue(key, root, parameters.get(key));} catch (OgnlException e) {e.printStackTrace();}}//打印root对象值System.out.println(root.getId()+" "+root.getUserName()+" "+root.getUserPassword());