formtag.java

structs源码

/*
 * $Id: FormTag.java 479633 2006-11-27 14:25:35Z pbenedict $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.struts.taglib.html;

import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.FormBeanConfig;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.taglib.TagUtils;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;

import java.io.IOException;

/**
 * Custom tag that represents an input form, associated with a bean whose
 * properties correspond to the various fields of the form.
 *
 * @version $Rev: 479633 $ $Date: 2006-11-27 08:25:35 -0600 (Mon, 27 Nov 2006) $
 */
public class FormTag extends TagSupport {
    /**
     * The line ending string.
     */
    protected static String lineEnd = System.getProperty("line.separator");

    /**
     * The message resources for this package.
     */
    protected static MessageResources messages =
        MessageResources.getMessageResources(Constants.Package
            + ".LocalStrings");

    // ----------------------------------------------------- Instance Variables

    /**
     * The action URL to which this form should be submitted, if any.
     */
    protected String action = null;

    /**
     * A postback action URL to which this form should be submitted, if any.
     */
    private String postbackAction = null;

    /**
     * The module configuration for our module.
     */
    protected ModuleConfig moduleConfig = null;

    /**
     * The content encoding to be used on a POST submit.
     */
    protected String enctype = null;

    /**
     * The name of the field to receive focus, if any.
     */
    protected String focus = null;

    /**
     * The index in the focus field array to receive focus.  This only applies
     * if the field given in the focus attribute is actually an array of
     * fields.  This allows a specific field in a radio button array to
     * receive focus while still allowing indexed field names like
     * "myRadioButtonField[1]" to be passed in the focus attribute.
     *
     * @since Struts 1.1
     */
    protected String focusIndex = null;

    /**
     * The ActionMapping defining where we will be submitting this form
     */
    protected ActionMapping mapping = null;

    /**
     * The request method used when submitting this form.
     */
    protected String method = null;

    /**
     * The onReset event script.
     */
    protected String onreset = null;

    /**
     * The onSubmit event script.
     */
    protected String onsubmit = null;

    /**
     * Include language attribute in the focus script's <script>
     * element.  This property is ignored in XHTML mode.
     *
     * @since Struts 1.2
     */
    protected boolean scriptLanguage = true;

    /**
     * The ActionServlet instance we are associated with (so that we can
     * initialize the <code>servlet</code> property on any form bean that we
     * create).
     */
    protected ActionServlet servlet = null;

    /**
     * The style attribute associated with this tag.
     */
    protected String style = null;

    /**
     * The style class associated with this tag.
     */
    protected String styleClass = null;

    /**
     * The identifier associated with this tag.
     */
    protected String styleId = null;

    /**
     * The window target.
     */
    protected String target = null;

    /**
     * The name of the form bean to (create and) use. This is either the same
     * as the 'name' attribute, if that was specified, or is obtained from the
     * associated <code>ActionMapping</code> otherwise.
     */
    protected String beanName = null;

    /**
     * The scope of the form bean to (create and) use. This is either the same
     * as the 'scope' attribute, if that was specified, or is obtained from
     * the associated <code>ActionMapping</code> otherwise.
     */
    protected String beanScope = null;

    /**
     * The type of the form bean to (create and) use. This is either the same
     * as the 'type' attribute, if that was specified, or is obtained from the
     * associated <code>ActionMapping</code> otherwise.
     */
    protected String beanType = null;

    /**
     * The list of character encodings for input data that the server should
     * accept.
     */
    protected String acceptCharset = null;

    /**
     * Controls whether child controls should be 'disabled'.
     */
    private boolean disabled = false;

    /**
     * Controls whether child controls should be 'readonly'.
     */
    protected boolean readonly = false;

    /**
     * The language code of this element.
     */
    private String lang = null;
    
    /**
     * The direction for weak/neutral text of this element.
     */
    private String dir = null;

    // ------------------------------------------------------------- Properties

    /**
     * Return the name of the form bean corresponding to this tag. There is no
     * corresponding setter method; this method exists so that the nested tag
     * classes can obtain the actual bean name derived from other attributes
     * of the tag.
     */
    public String getBeanName() {
        return beanName;
    }

    /**
     * Return the action URL to which this form should be submitted.
     */
    public String getAction() {
        return (this.action);
    }

    /**
     * Set the action URL to which this form should be submitted.
     *
     * @param action The new action URL
     */
    public void setAction(String action) {
        this.action = action;
    }

    /**
     * Return the content encoding used when submitting this form.
     */
    public String getEnctype() {
        return (this.enctype);
    }

    /**
     * Set the content encoding used when submitting this form.
     *
     * @param enctype The new content encoding
     */
    public void setEnctype(String enctype) {
        this.enctype = enctype;
    }

    /**
     * Return the focus field name for this form.
     */
    public String getFocus() {
        return (this.focus);
    }

    /**
     * Set the focus field name for this form.
     *
     * @param focus The new focus field name
     */
    public void setFocus(String focus) {
        this.focus = focus;
    }

    /**
     * Return the request method used when submitting this form.
     */
    public String getMethod() {
        return (this.method);
    }

    /**
     * Set the request method used when submitting this form.
     *
     * @param method The new request method
     */
    public void setMethod(String method) {
        this.method = method;
    }

    /**
     * Return the onReset event script.
     */
    public String getOnreset() {
        return (this.onreset);
    }

    /**
     * Set the onReset event script.
     *
     * @param onReset The new event script
     */
    public void setOnreset(String onReset) {
        this.onreset = onReset;
    }

    /**
     * Return the onSubmit event script.
     */
    public String getOnsubmit() {
        return (this.onsubmit);
    }

    /**
     * Set the onSubmit event script.
     *
     * @param onSubmit The new event script
     */
    public void setOnsubmit(String onSubmit) {
        this.onsubmit = onSubmit;
    }

    /**
     * Return the style attribute for this tag.
     */
    public String getStyle() {
        return (this.style);
    }

    /**
     * Set the style attribute for this tag.
     *
     * @param style The new style attribute
     */
    public void setStyle(String style) {
        this.style = style;
    }

    /**
     * Return the style class for this tag.
     */
    public String getStyleClass() {
        return (this.styleClass);
    }

    /**
     * Set the style class for this tag.
     *
     * @param styleClass The new style class
     */
    public void setStyleClass(String styleClass) {
        this.styleClass = styleClass;
    }

    /**
     * Return the style identifier for this tag.
     */
    public String getStyleId() {
        return (this.styleId);
    }

    /**
     * Set the style identifier for this tag.
     *
     * @param styleId The new style identifier
     */
    public void setStyleId(String styleId) {
        this.styleId = styleId;
    }

    /**
     * Return the window target.
     */
    public String getTarget() {
        return (this.target);
    }

    /**
     * Set the window target.
     *
     * @param target The new window target
     */
    public void setTarget(String target) {
        this.target = target;
    }

    /**
     * Return the list of character encodings accepted.
     */
    public String getAcceptCharset() {
        return acceptCharset;
    }

    /**
     * Set the list of character encodings accepted.
     *
     * @param acceptCharset The list of character encodings
     */
    public void setAcceptCharset(String acceptCharset) {
        this.acceptCharset = acceptCharset;
    }

    /**
     * Sets the disabled event handler.
     */
    public void setDisabled(boolean disabled) {
        this.disabled = disabled;
    }

    /**
     * Returns the disabled event handler.
     */
    public boolean isDisabled() {
        return disabled;
    }

    /**
     * Sets the readonly event handler.
     */
    public void setReadonly(boolean readonly) {
        this.readonly = readonly;
    }

    /**
     * Returns the readonly event handler.
     */
    public boolean isReadonly() {
        return readonly;
    }

    /**
     * Returns the language code of this element.
     * 
     * @since Struts 1.3.6
     */
    public String getLang() {
        return this.lang;
    }

    /**
     * Sets the language code of this element.
     * 
     * @since Struts 1.3.6
     */
    public void setLang(String lang) {
        this.lang = lang;
    }

    /**
     * Returns the direction for weak/neutral text this element.
     * 
     * @since Struts 1.3.6
     */
    public String getDir() {
        return this.dir;
    }

    /**
     * Sets the direction for weak/neutral text of this element.
     * 
     * @since Struts 1.3.6
     */
    public void setDir(String dir) {
        this.dir = dir;
    }

    // --------------------------------------------------------- Public Methods

    /**
     * Render the beginning of this form.
     *
     * @throws JspException if a JSP exception has occurred