Web4J是一個比較新潮的Web框架，具體信息可以參考官網的相關說明：
http://www.web4j.com/，下面是我的簡單試用
1、數據庫準備（MySQL）：
創建一個數據庫和一個單表：
create database test4j;
use test4j;
create table tbl_log(
log_id mediumint unsigned auto_increment primary key,
log_msg varchar(100) not null,
log_date date
)type=innodb;
insert into tbl_log values(1,'good job',curdate());
2、web4j.jar改進：
將AppInfo等7個類打包到web4j.jar中
3、開始試用：
配置web.xml：
<servlet-name>Controller</servlet-name>
<servlet-class>hirondelle.web4j.Controller</servlet-class>
<init-param>
<description>
</description>
<param-name>ImplicitMappingRemoveBasePackage</param-name>
<param-value>test</param-value>
</init-param>
<init-param>
<param-name>ImplementationFor.hirondelle.web4j.ApplicationInfo</param-name>
<param-value>test.main.AppInfo</param-value>
<description>
</description>
</init-param>
<init-param>
<description>
</description>
<param-name>LoggingDirectory</param-name>
<param-value>E:\jdev\eclipse\workspace\My4JTest\log\</param-value>
</init-param>
<init-param>
<param-name>DefaultDbConnectionString</param-name>
<param-value>java:comp/env/jdbc/test4j</param-value>
</init-param>
..
<resource-ref>
<description>DB Connection Pool For Main Application</description>
<res-ref-name>jdbc/test4j</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
相應的tomcat部署文件test4j.xml為：
<Context path="/test4j" docBase="E:\jdev\eclipse\workspace\My4JTest\WebContent"
debug="5" reloadable="true" crossContext="true">
<Resource name="jdbc/test4j" auth="Container" type="javax.sql.DataSource"
username="root" password="root" driverClassName="org.gjt.mm.mysql.Driver"
url="jdbc:mysql://localhost:3306/test4j?useServerPrepStmts=false"
maxActive="10" maxIdle="5" />
</Context>
主干文件的編寫：
MODEL：
package test.main;
import static hirondelle.web4j.util.Consts.FAILS;
import hirondelle.web4j.model.Check;
import hirondelle.web4j.model.Id;
import hirondelle.web4j.model.ModelCtorException;
import hirondelle.web4j.model.ModelUtil;
import hirondelle.web4j.security.SafeText;
import java.util.Date;
public final class Log {
private Id logId;
private SafeText logMsg;
private Long logDate;
private void validate() throws ModelCtorException {
ModelCtorException ex = new ModelCtorException();
if (FAILS == Check.optional(logMsg, Check.range(0, 100))) {
ex.add("Message cannot be longer than 1,000 characters.");
}
if (ex.isNotEmpty()) {
throw ex;
}
}
public Id getLogId() {
return logId;
}
public SafeText getLogMsg() {
return logMsg;
}
public Date getLogDate() {
return new Date(logDate);
}
public Log(Id id, SafeText msg, Date date) throws ModelCtorException {
this.logId = id;
this.logMsg = msg;
this.logDate = date == null ? null : date.getTime();
validate();
}
@Override
public String toString() {
return ModelUtil.toStringFor(this);
}
}
ACTION:
package test.main;
import hirondelle.web4j.action.ActionTemplateListAndEdit;
import hirondelle.web4j.action.ResponsePage;
import hirondelle.web4j.database.DAOException;
import hirondelle.web4j.database.SqlId;
import hirondelle.web4j.model.ModelCtorException;
import hirondelle.web4j.model.ModelFromRequest;
import hirondelle.web4j.request.RequestParameter;
import hirondelle.web4j.request.RequestParser;
import hirondelle.web4j.util.Util;
import java.util.logging.Logger;
public final class LogAction extends ActionTemplateListAndEdit {
private static final ResponsePage FORWARD = TmplPage.get("Log", "view.jsp", LogAction.class);
private static final ResponsePage REDIRECT = new ResponsePage("LogAction.list");
private LogDAO fDAO = new LogDAO();
private Log fModel;
private static final Logger fLogger = Util.getLogger(LogAction.class);
public static final RequestParameter MSG = RequestParameter.withLengthCheck("LogMsg");
public static final RequestParameter ID = RequestParameter.withLengthCheck("LogId");
public static final RequestParameter DATE = RequestParameter.withLengthCheck("LogDate");
public static final SqlId LIST_LOG = new SqlId("LIST_LOG");
public static final SqlId FETCH_LOG = new SqlId("FETCH_LOG");
public static final SqlId ADD_LOG = new SqlId("INSERT_LOG");
public static final SqlId CHANGE_LOG = new SqlId("UPDATE_LOG");
public static final SqlId DELETE_LOG = new SqlId("DELETE_LOG");
public LogAction(RequestParser aRequestParser) {
super(FORWARD, REDIRECT, aRequestParser);
}
@Override
protected void attemptAdd() throws DAOException {
fLogger.fine("Attempting to add new Spending item.");
fDAO.add(fModel);
addMessage("Item added successfully.");
}
@Override
protected void attemptChange() throws DAOException {
fLogger.fine("Attempting to change an existing log item.");
boolean success = fDAO.change(fModel);
if (success) {
addMessage("Item changed successfully.");
} else {
addError("No update occurred. Item likely deleted by another user.");
}
}
@Override
protected void attemptDelete() throws DAOException {
fLogger.fine("Attempting to delete an existing log item.");
fDAO.delete(getIdParam(ID));
addMessage("Item deleted successfully.");
}
@Override
protected void attemptFetchForChange() throws DAOException {
fLogger.fine("Attempting to fetch an existing log item.");
Log model = fDAO.fetch(getIdParam(ID));
if (model == null) {
addError("Item no longer exists. Likely deleted by another user.");
} else {
addToRequest(ITEM_FOR_EDIT, model);
}
}
@Override
protected void doList() throws DAOException {
fLogger.fine("Listing all log items.");
addToRequest(ITEMS_FOR_LISTING, fDAO.list());
}
@Override
protected void validateUserInput() {
fLogger.fine("Validating user input.");
ModelFromRequest builder = new ModelFromRequest(getRequestParser());
try {
fModel = builder.build(Log.class, ID, MSG, DATE);
} catch (ModelCtorException ex) {
addError(ex);
}
}
}
DAO:
package test.main;
import static test.main.LogAction.ADD_LOG;
import static test.main.LogAction.CHANGE_LOG;
import static test.main.LogAction.DELETE_LOG;
import static test.main.LogAction.FETCH_LOG;
import static test.main.LogAction.LIST_LOG;
import hirondelle.web4j.database.DAOException;
import hirondelle.web4j.database.Db;
import hirondelle.web4j.model.Id;
import hirondelle.web4j.util.Util;
import java.util.List;
final class LogDAO {
private Object[] baseParamsFrom(Log aLog) {
return new Object[] { aLog.getLogMsg() };
}
List<Log> list() throws DAOException {
return Db.list(Log.class, LIST_LOG);
}
Log fetch(Id aId) throws DAOException {
return Db.fetch(Log.class, FETCH_LOG, aId);
}
void add(Log aLog) throws DAOException {
Db.add(ADD_LOG, baseParamsFrom(aLog));
}
boolean change(Log aLog) throws DAOException {
Object[] params = Db.addIdTo(baseParamsFrom(aLog), aLog.getLogId());
return Util.isSuccess(Db.edit(CHANGE_LOG, params));
}
void delete(Id aId) throws DAOException {
Db.delete(DELETE_LOG, aId);
}
}
statements.sql文件：
LIST_LOG {
SELECT log_id, log_msg, log_date
FROM tbl_log
ORDER BY log_date DESC
}
FETCH_LOG {
SELECT log_id, log_msg, log_date
FROM tbl_log
WHERE log_id =?
}
INSERT_LOG {
INSERT INTO tbl_log (log_msg, log_date) VALUES (?,curdate())
}
UPDATE_LOG {
UPDATE tbl_log SET log_msg=? WHERE log_id=?
}
DELETE_LOG {
DELETE FROM tbl_log WHERE log_id=?
}
視圖view.jsp文件：
<%-- List-and-edit form for Electricity Spending. --%>
<%@ include file="/JspHeader.jsp"%>
<c:set value='LogAction' var='baseURL' />
<tags:setFormTarget using='${baseURL}' />
<%-- Form for adds and edits. --%>
<form action='${formTarget}' method="post" class="user-input">
<table align="center">
<w:populate using="itemForEdit">
<input name="LogId" type="hidden">
<input name="LogDate" type="hidden">
<tr>
<td><label>LOG MSG:</label></td>
<td><input name="LogMsg" type="text" maxlength='100'></td>
</tr>
</w:populate>
<tr>
<td align="center"><input type="submit" value="Add/Edit">
</td>
</tr>
</table>
</form>
<P><%-- Listing of all items. --%>
<table class="report" align="center">
<caption>Here is The Logs</caption>
<tr>
<th title="Line Number">#</th>
<th title='Log Msg'>Log Msg</th>
<th title='Log Date'>Log Date</th>
<th></th>
</tr>
<w:alternatingRow>
<c:forEach var="item" items="${itemsForListing}" varStatus="index">
<tr class="row_highlight">
<td title="Line Number">${index.count}</td>
<td>${item.logMsg}</td>
<td align='right'><c:set value="${item.logDate}" var="paidOn" />
<w:showDate name='paidOn' pattern='yyyy-MM-dd' /></td>
<tags:editLinks baseURL='${baseURL}' id='${item.logId}' />
</tr>
</c:forEach>
</w:alternatingRow>
</table>
更多內容請參考附件，接下就是將test4j.xml文件拷貝到conf\Catalina\localhost路徑下，啟動tomcat之后，訪問http://localhost:8080/test4j即可看到效果
下載附件請點擊此處（內容為eclipse工程的壓縮包）：
MyWeb4JTest