Application of form label in struts1.2---(Form and text use) source analysis

One, the text label as an example

1. Configure

In Web.xml

<taglib>
	<taglib-uri>/html</taglib-uri>
	<taglib-location>/web-inf/ Struts-html.tld</taglib-location>
</taglib>

The use of 2.jsp

<%@ taglib uri= "/html" prefix= "html"%>

<tr id= "Auctionbidmodel" >
						<td align= "right" >
							<span class= "Fc-hong" >*</span> specification:
						</td>
						<td>
 


3. Switch to content via Struts label processor


<input type= "text" name= "Bean.bidmodel" value= "HHL" class= "Input-text" >
 

 


Second, look at its conversion process, source analysis

Basefieldtag.java

 public int doStartTag () throws jspexception {/* <-MISALIGNED->/* 81*/Tagu
Tils.getinstance (). Write (Super.pagecontext, renderinputelement ());
            /* <-MISALIGNED->/* 83*/return 2; } protected String Renderinputelement () throws jspexception {/* <-misaligned-& Gt */* 93*/stringbuffer results = new StringBuffer ("<input");/* 95*/Prepareattribute (results, "type",
Type);
/* 96*/Prepareattribute (results, "name", Preparename ());
/* 97*/Prepareattribute (results, "accesskey", Getaccesskey ());
/* 98*/Prepareattribute (results, "accept", getaccept ());
/* 99*/Prepareattribute (results, "maxlength", Getmaxlength ());
/* 100*/Prepareattribute (results, "size", getcols ());
/* 101*/Prepareattribute (results, "TabIndex", Gettabindex ());
/* 102*/Preparevalue (results); /* 103*/Results.append (prepareeventhAndlers ());
/* 104*/Results.append (Preparestyles ());
/* 105*/prepareotherattributes (results);
/* 106*/Results.append (Getelementclose ());
            /* 107*/return results.tostring (); }
 


The main view of the value of the acquisition

protected void Preparevalue (StringBuffer results)
                throws Jspexception
            {




/* 116*/results.append        (" Value=\ "");
/* 117*/        if (super.value!= null)/
* 118*/            results.append (Formatvalue (Super.value));

/* 120*/        else/* 120*/        if (redisplay | |!) Password ". Equals (type))
                {/* 121*/            Object value = Tagutils.getinstance (). Lookup (Super.pagecontext, Super.name, super.property, null);


/* 124*/            results.append (Formatvalue (value));
                }

/* 127*/        results.append (' ");
            }
 


Lookup method, where name is name = "Org.apache.struts.taglib.html.BEAN";


Public Object Lookup (PageContext pagecontext, string name, String scopeName) throws Jspexception



{/* 887*/if (scopeName = null)/* 888*/return Pagecontext.findattribute (name);  /* 892*/try {/* <-MISALIGNED->/* 892*/return Pagecontext.getattribute (name,
                Instance.getscope (ScopeName)); }/* 895*/catch (jspexception e) {/* <-MISALIGNED->//* 895*/saveexception (page
Context, E);
                /* <-MISALIGNED->/* 896*/throw E;
                } public Object Lookup (PageContext pagecontext, string name, string, string scope)        Throws Jspexception {/* 930*/Object bean = lookup (PageContext, name, scope);/* 931*/ if (bean = = null) {/* 932*/jspexception e = null;/* 933*/if (scope = null)/ * 934*/e =New Jspexception (Messages.getmessage ("Lookup.bean.any", name));



/* 936*/else/* 936*/e = new Jspexception (Messages.getmessage ("Lookup.bean", name, scope);
/* 940*/saveexception (PageContext, E);
                /* 941*/throw E;




}/* 944*/if (property = = null)/* 945*/return bean; /* 950*/try {/* <-MISALIGNED->/* 950*/return Propertyutils.getproperty (bean
                , property); }/* 953*/catch (illegalaccessexception e) {* * <-MISALIGNED-> * * 953*/SAVEEXCE
Ption (PageContext, E); /* <-MISALIGNED->/* 954*/throw new Jspexception (Messages.getmessage ("lookup.access", property, name)
                ); }/* 958*/catch (illegalargumentexception e) {/* <-MISALIGNED->///* 958*/Savee
Xception (PageContext, E); /* <-MISALIGNED->//* 959*/throw NEW jspexception (Messages.getmessage ("Lookup.argument", property, name)); }/* 963*/catch (invocationtargetexception e) {/* <-MISALIGNED->///* 963*/Thro
Wable t = e.gettargetexception (); /* <-MISALIGNED->/* 964*/if (t = = null)/* <-MISALIGNED->/* 965*/t = e;/* 9
67*/saveexception (PageContext, T);
                /* 968*/throw new Jspexception (Messages.getmessage ("Lookup.target", property, name)); }/* 972*/catch (nosuchmethodexception e) {/* <-MISALIGNED->///* 972*/Saveex
                Ception (PageContext, E); 
            }/* <-MISALIGNED-> * * 973*/throw new Jspexception (Messages.getmessage ("Lookup.method", property, name)); }
 

 


One of the most important beans to get

Object Bean = lookup (PageContext, name, scope);



Because scope is null, you go through the following process

if (ScopeName = null)/
* 888*/return            pagecontext.findattribute (name);
 

where name is name = "Org.apache.struts.taglib.html.BEAN", then what is the BEAN obtained from this name, and the form label is required



Third, form label

1.jsp form label used

 

After the label processor becomes

<form name= "Storeproductform" method= "post" action= "/yunboce/store/manager/product/auctionproductadd.do" >
 

2. Look at the processing

Formtag.java

public int doStartTag ()
                throws Jspexception
            {/









*        443*/lookup ();


/* 446*/        stringbuffer results = new StringBuffer ();

/* 448*/        Results.append (Renderformstartelement ());

/* 450*/        Results.append (RenderToken ());

/* 452*/        tagutils.getinstance (). Write (Super.pagecontext, results.tostring ());


/* 455*/        Super.pageContext.setAttribute ("Org.apache.struts.taglib.html.FORM", this, 2);

/* 457*/        Initformbean ();    Important processing of the above bean

/* 459*/return        1;
            }
 

Look at the Initformbean method, which

protected void Initformbean () throws jspexception {/* 469*/int scope = 3;/* 470


*/if ("Request". Equalsignorecase (Beanscope))/* 471*/scope = 2;
/* 474*/Object bean = Super.pageContext.getAttribute (beanname, scope); /* 475*/if (bean = = null) {/* 477*/bean = requestutils.createactionform (httpservletre





Quest) Super.pageContext.getRequest (), mapping, Moduleconfig, servlet); /* 483*/if (bean instanceof actionform)/* 484*/((actionform) bean). Reset (Mapping, HTTPSERVLETR

equest) super.pageContext.getRequest ()); /* 486*/if (bean = = null)/* 487*/throw new Jspexception (Messages.getmessage ("Formtag.create")

Beantype));
                /* 489*/Super.pageContext.setAttribute (beanname, bean, scope);    }/* 491*/Super.pageContext.setAttribute ("Org.apache.struts.taglib.html.BEAN", BEAN, 2);
           The above bean is added here } 
 

So what is this bean, first look at the object bean = Super.pageContext.getAttribute (beanname, scope), and the parameter beanname, whose value is assigned in lookup


protected void Lookup () throws Jspexception {/* 738*/moduleconfig = tagutils.getins

Tance (). Getmoduleconfig (Super.pagecontext); /* 740*/if (moduleconfig = = null) {/* 741*/jspexception e = new Jspexception (MESSAGES.G
Etmessage ("Formtag.collections"));
/* 742*/Super.pageContext.setAttribute ("Org.apache.struts.action.EXCEPTION", E, 2);
                /* 743*/throw E; }/* 745*/servlet = (actionservlet) super.pageContext.getServletContext (). getattribute ("Org.apache.struts.action.AC




Tion_servlet ");
/* 750*/String mappingName = Tagutils.getinstance (). Getactionmappingname (action);
/* 751*/mapping = (actionmapping) moduleconfig.findactionconfig (mappingName); /* 752*/if (mapping = = NULL) {/* 753*/jspexception e = new Jspexception (messages.getmes
Sage ("formtag.mapping", MappingName)); /* 754*/Super.pageContext.setAttribute ("org.aPache.struts.action.EXCEPTION ", E, 2);
                /* 755*/throw E;
}/* 759*/formbeanconfig formbeanconfig = Moduleconfig.findformbeanconfig (Mapping.getname ()); /* 760*/if (formbeanconfig = = null) {/* 761*/jspexception e = new Jspexception (Messages

. GetMessage ("Formtag.formbean", Mapping.getname (), action));
/* 763*/Super.pageContext.setAttribute ("Org.apache.struts.action.EXCEPTION", E, 2);
                /* 764*/throw E;    else {/* 768*/Beanname = Mapping.getattribute ();
Beanname value, mapping to get/* 769*/Beanscope = Mapping.getscope ();
/* 770*/Beantype = Formbeanconfig.gettype ();
                /* 771*/return; }
            }
 

 
See here it should be understood that beanname is to get the properties in the mapping, whose values are configured in the Struts configuration file


<?xml version= "1.0" encoding= "UTF-8"?> <!
DOCTYPE struts-config Public "-//apache Software foundation//dtd struts Configuration 1.1//en" "http:// Jakarta.apache.org/struts/dtds/struts-config_1_1.dtd ">
<struts-config>
	<data-sources> </data-sources>
	<form-beans>
		<form-bean name= "Storeproductform"
			type= " Com.aebiz.store.product.controller.ProductForm "/>
	</form-beans>
	<global-forwards></ global-forwards>
	<action-mappings>
		<action input= "/store/manager/auctionproduct/ auctionproductadd.jsp "
			name=" Storeproductform "path="/store/manager/product/auctionproductadd "
			scope=" "Session"
			type= "com.aebiz.store.auctionProduct.controller.AuctionProductAction" >
			<forward name= "Add"
				path= "/store/manager/auctionproduct/auctionproductadd.jsp"/>
		</action>
	</ Action-mappings>
</struts-config>
 

 
At this point, the bean used in the text label knows what it is (in this case productform), and value is

Propertyutils.getproperty (bean, property);


public static object GetProperty (Object bean, String name)
                throws Illegalaccessexception, InvocationTargetException, nosuchmethodexception
            {

/* 290*/return        propertyutilsbean.getinstance (). GetProperty (bean, name);
            
 

 
public object GetProperty (object bean, String name)
                throws Illegalaccessexception, InvocationTargetException, Nosuchmethodexception
            {

/* 715*/return        getnestedproperty (bean, name);
            
 

 
 public object Getnestedproperty (object bean, String name) throws Illegalaccessexception, Invocationtarget Exception, nosuchmethodexception {/* 631*/if (bean = null)/* 632*/throw new Illegalargu

Mentexception ("No bean Specified");


/* 634*/if (name = = NULL)/* 635*/throw new IllegalArgumentException ("No name specified");
/* 638*/int indexofindexed_delim =-1;
/* 639*/int indexofmapped_delim =-1;
/* 640*/int indexofmapped_delim2 =-1;

/* 641*/int indexofnested_delim =-1; /* 643*/do {/* <-MISALIGNED->/* 643*/Indexofnested_delim = Name.indexof ('. ')
); /* <-MISALIGNED->///* 644*/Indexofmapped_delim = Name.indexof (');/* <-MISALIGNED->///* 645*
/indexofmapped_delim2 = Name.indexof (') '); /* <-MISALIGNED->/* 646*/if (indexofmapped_delim2 >= 0 && indexofmapped_delim >= 0&& (Indexofnested_delim < 0 | | indexofnested_delim > Indexofmapped_delim))/* 648*/Indexofnes


Ted_delim = Name.indexof ('. ', indexofmapped_delim2);

/* 651*/else/* 651*/indexofnested_delim = Name.indexof ('. ');

/* 653*/if (Indexofnested_delim < 0)/* 654*/break;
/* 656*/String next = name.substring (0, Indexofnested_delim); 
/* 657*/Indexofindexed_delim = next.indexof (' [');/* 658*/Indexofmapped_delim = Next.indexof (' (');
/* 659*/if (bean instanceof map)/* 660*/bean = ((MAP) bean). get (next); /* 661*/else/* 661*/if (indexofmapped_delim >= 0)/* 662*/bean = Getmappedproper
Ty (bean, next); /* 663*/else/* 663*/if (indexofindexed_delim >= 0)/* 664*/bean = Getindexedprop

Erty (Bean, next); /* 666*/else/* 666*/bean = Getsimpleproperty (bean, next); /* 668*/if (bean = = null)/* 669*/throw new Nestednullexception ("Null property value for" + N



Ame.substring (0, Indexofnested_delim) + "'");
                /* 673*/name = name.substring (Indexofnested_delim + 1);

} while (true);

/* 676*/Indexofindexed_delim = name.indexof (' [');/* 677*/Indexofmapped_delim = Name.indexof (' (');
/* 679*/if (bean instanceof map)/* 680*/bean = ((MAP) bean). get (name); /* 681*/else/* 681*/if (indexofmapped_delim >= 0)/* 682*/bean = getmappedproperty (Bean, NAM
e); /* 683*/else/* 683*/if (indexofindexed_delim >= 0)/* 684*/bean = getindexedproperty (Bean, n

AME);         /* 686*/else/* 686*/bean = getsimpleproperty (bean, name);
            Final use of reflection to get value/* 688*/return bean; }
 

Where there is the processing of the dot character, and so on, get the value of the bean to get the value of the property, so the Bean.bidmodel value of the original tag gets the

 

public object Getsimpleproperty (object bean, String name) throws Illegalaccessexception, Invocationtargete Xception, Nosuchmethodexception {/*1088*/if (bean = = null)/*1089*/throw new Illegalargum

Entexception ("No bean Specified");



/*1091*/if (name = = null)/*1092*/throw new IllegalArgumentException ("No name specified"); /*1096*/if (Name.indexof ('. ') >= 0)/*1097*/throw new IllegalArgumentException ("Nested Property name

s are not allowed "); /*1099*/if (Name.indexof (' [') >= 0)/*1100*/throw new IllegalArgumentException ("Indexed Property nam

Es are not allowed "); /*1102*/if (Name.indexof (') >= 0)/*1103*/throw new IllegalArgumentException ("mapped property name
                s are not allowed ");



PropertyDescriptor descriptor; /*1108*/if (bean instanceof Dynabean) {/*1109*/descriptor = ((Dynabean) bean). Getdynacla ss). Getdynaproperty (name); /*1111*/if (descriptor = null)/*1112*/throw new Nosuchmethodexception ("Unknown Property" +


Name + "'");
                /*1115*/else/*1115*/return ((Dynabean) beans). get (name);

}/*1119*/Descriptor = Getpropertydescriptor (bean, name); /*1121*/if (descriptor = = null)/*1122*/throw new Nosuchmethodexception ("Unknown Property" + Name + "


'");
/*1125*/Method Readmethod = Getreadmethod (descriptor);  /*1126*/if (Readmethod = = null) {/*1127*/throw new Nosuchmethodexception ("property" +
                Name + "' has no Getter method");            else {/*1132*/Object value = InvokeMethod (Readmethod, Bean, new object[0);/*1133*/
                return value; }
            }