STRUTS2 new JSON return type, automatically converts the member variable in the action to a JSON string

Made a small test struts2,spring,mybatis framework, the required jar package is as follows:

New result Type:json

Jsonresult.java

Package Com.test.xiaobc.login.server.util;import Java.beans.beaninfo;import Java.beans.introspector;import Java.beans.propertydescriptor;import Java.io.ioexception;import Java.io.outputstream;import Java.lang.reflect.method;import Java.util.calendar;import Java.util.date;import Java.util.HashSet;import Java.util.set;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Org.apache.commons.lang.stringutils;import Org.apache.commons.logging.log;import Org.apache.commons.logging.logfactory;import Org.apache.struts2.servletactioncontext;import Org.codehaus.jackson.jsongenerationexception;import Org.codehaus.jackson.map.jsonmappingexception;import Com.test.xiaobc.base.action.abstractaction;import Com.opensymphony.xwork2.actioninvocation;import Com.opensymphony.xwork2.result;import Com.opensymphony.xwork2.inject.inject;public class JsonResult implements result{/** inherit properties from Actionsupport */protected static final set<string> fields = new Hashset< String> ();p rivate static final long serialversionuid = 8840245761025613454l;private String defaultencoding = "UTF-8"; Private log log = Logfactory.getlog (GetClass ());p rivate String includeproperties;private set<string> includepropertiesset;/** * <action name= "findAll" class= "orderbillaction" method= "FindAll" > * <result name= ' Success ' type= ' json ' > * <param name= ' contentType ' >text/html</param> * </result> * </action> */private string contenttype;/** Serialization property, default to null replaced by empty string */private jsonfeature feature =    Jsonfeature.getdefaultjsonfeature ();/** * Call the JS function name */private String callbackparameter; static {Fields.Add ("actionerrors"); Fields.Add ("Actionmessages"); Fields.Add ("class"); Fields.Add ("Errormessages"); Fields.Add ("errors"); Fields.Add ("locale"); Fields.Add ("Fielderrors"); Fields.Add ("texts"); Fields.Add ("Success"); Fields.Add ("Isexception");}   @Inject ("struts.i18n.encoding") public void Setdefaultencoding (String val) {this.defaultencoding = val;} /**   * * <p> SET encoding format utf-8</p> * @date 2013-4-3 9:35:08 * @return * @see */protected String Gete Ncoding () {String encoding = this.defaultencoding;if (encoding = = NULL) {encoding = System.getproperty ("file.encoding");} if (encoding = = NULL) {encoding = "UTF-8";} return encoding;}    Public String getincludeproperties () {return includeproperties;}     /** * * <p> split contains properties file </p> * @date 2013-4-3 a.m. 9:35:39 * @param includeproperties * @see */public void Setincludeproperties (String includeproperties) {if (includeproperties = = null) {return;} This.includeproperties = includeproperties; String[] Properties = This.includeProperties.split (","); includepropertiesset = new hashset<string> (); for ( String property:properties) {Includepropertiesset.add (property);} This.setincludepropertieslist (Includepropertiesset);} Public set<string> getincludepropertieslist () {return includepropertiesset;} public void Setincludepropertieslist (SET&LT;STRIng> includepropertieslist) {this.includepropertiesset = includepropertieslist;} Public String getContentType () {return contentType;} public void setContentType (String contentType) {this.contenttype = ContentType;}    Public String Getfeature () {return feature.getfeature (); public void Setfeature (String feature) {if (Stringutils.isnotblank (feature) &&!this.feature.getfeature ().    Equals (feature)) {this.feature = new jsonfeature (feature); }}/** * Serialize the object into JSON * * @param val * @param sb * @throws jsongenerationexception * @throws jsonmappingexception * @throws IOException */private void Serialize (Object val, StringBuilder sb) throws Jsongenerationexception, Jsonmappingexception, IOException {if (val = = null) {Sb.append (Feature.dofeature ()). Append (",");} else if (val instanceof Number | | Val instanceof Boolean) {sb.append (val.tostring ()). Append (",");} else if (val instanceof Date) {sb.append ((Long) ((date) val). GetTime ()). Append (",");} else if (Val InstaNceof Calendar) {sb.append ((Long) ((Calendar) val). GetTime (). GetTime ()). Append (",");} else {sb.append (    Feature.dofeature (Jsonhelps.tostring (val))). Append (",");}} /** * * <p> input json</p> * @date 2013-4-3 a.m. 9:37:10 * @param invocation * @throws Except Ion * @see Com.opensymphony.xwork2.result#execute (com.opensymphony.xwork2.ActionInvocation) */public void execute (Actioninvocation invocation) throws Exception {if (log.isdebugenabled ()) {Log.debug ("Begin Jsonresult");} HttpServletRequest request= servletactioncontext.getrequest (); HttpServletResponse response = Servletactioncontext.getresponse (); if (getcontenttype () = null) { Response.setcontenttype (This.getcontenttype ());} else {response.setcontenttype ("Application/json");} Response.setcharacterencoding (defaultencoding); StringBuilder sb = new StringBuilder (); Sb.append ("{"); Object obj = Invocation.getaction (); BeanInfo IP = introspector.getbeaninfo (Obj.getclass ()); propertydescriptor[] Pros = Ip.getpRopertydescriptors ()///For Success, isexception property special handling if (obj instanceof abstractaction) {//Here is the parent class action ( abstractaction) PropertyDescriptor spd = new PropertyDescriptor ("Success", Obj.getclass ()); Method SMD = Spd.getreadmethod (), Object success = Smd.invoke (obj),///Return success attribute name preceded and preceded by double quotation marks sb.append ("\" Success\ ""). Append (":"); Serialize (success, SB); PropertyDescriptor EPD = new PropertyDescriptor ("Exception", Obj.getclass ()); Method EMD = Epd.getreadmethod (), Object isexception = Emd.invoke (obj),///return Isexception attribute name preceded and preceded by double quotation marks sb.append ("\" Isexception\ ""). Append (":"); Serialize (Isexception, SB);} for (PropertyDescriptor Pro:pros) {if (Includepropertiesset! = null &&!includepropertiesset.contains ( Pro.getdisplayname ())) {continue;} Method method = Pro.getreadmethod (); if (Method! = null) {Object val = method.invoke (obj, new object[0]); String proname = Pro.getdisplayname (); if (Fields.contains (Proname)) {continue;} All property names of the returned request class are preceded and followed by double quotation marks sb.append ("\" "); Sb.append (Pro.getdisplayname ()); Sb.append (" \ ""); Sb.append (": "); Serialize (Val, SB);}} String result = "", if (Sb.length () > 1) {result = sb.substring (0, Sb.length ()-1);}    result = Result.concat ("}"); result = addcallbackifapplicable (request, result); OutputStream out = Response.getoutputstream (); Out.write ( Result.getbytes (defaultencoding)); Out.flush (); Out.close (); /** * Add JS method call * @date 2012-12-5 PM 3:35:43 * @param request * @param JSON * @return * @see */private String Addcallbackifa Pplicable (HttpServletRequest request, String JSON) {if ((callbackparameter! = null) && (callbackparameter.            Length () > 0) {String callbackname = Request.getparameter (Callbackparameter); if ((callbackname! = null) && (callbackname.length () > 0)) {json = Callbackname + "(" + JSON +            ")";    }} return JSON; }public void Setcallbackparameter (String callbackparameter) {this.callbackparameter = Callbackparameter;} Public String Getcallbackparameter () {REturn Callbackparameter; }}class jsonfeature {public static final String allow_null_replaced_empty = "Allow_null_replaced_empty";p ublic static Final string allow_null = "Allow_null";p ublic static final String regex_null = "[' \"]*null[' \ "]*";p ublic static final Stri  ng empty_string = "\" \ "";p ublic static final STRING null_string = "NULL"; static final jsonfeature defaultjsonfeature = new Jsonfeature (allow_null);p rivate string Feature;public jsonfeature (String feature) {this.feature = feature;} public static Jsonfeature Getdefaultjsonfeature () {return defaultjsonfeature;} Public String Getfeature () {return feature;} /** * Returns the corresponding string according to the attribute * * @return string */public strings Dofeature () {if (Feature.equalsignorecase (Allow_null_replaced_empty))        {return empty_string;        } else {return null_string; }}/** * Replace the string based on the attribute and return the replaced string * * @param str replaced by the target * @return the substituted string */public string dofeature (String str) {if (Feature.eq Ualsignorecase (Allow_null_replaced_empty)) {return STR.REplaceall (Regex_null, empty_string);} else {return str;}}}

Add the result type in Struts.xml:

<!--define a resulttype--><result-types><result-type name= "JSON" class= " Com.test.xiaobc.login.server.util.JsonResult "></result-type></result-types>

The above Jsonresult.java use a tool class Jsonhelps.java:

Package Com.test.xiaobc.login.server.util;import Com.alibaba.fastjson.json;import com.alibaba.fastjson.serializer.serializerfeature;/** * JSON Tool class * <p style= "Display:none" >modifyRecord</p > * @since */public abstract class Jsonhelps {/** * object serialized as JSON string * @param obj * @return */public static final Stri ng toString (Object obj) {return json.tojsonstring (obj, Serializerfeature.writemapnullvalue, Serializerfeature.disablecircularreferencedetect);}}

Finally, configure the return type of the action:

<action name= "menu" class = "loginaction" method = "Menu" ><result name= "Success" type= "JSON"/><result Name= "Error"/></action>

There are corresponding member variables in the action, and there is a Get,set method:

Then the foreground returns a string after the request:

STRUTS2 new JSON return type, automatically converts the member variable in the action to a JSON string