[template engine]StringTemplate的使用

1 变量替换
public static void fun1() {
StringTemplate st = new StringTemplate(
"对象变量替换 姓名:$KeyList.Name$, 年龄:$KeyList.Age$ ");
HashMap ht = new HashMap();
ht.put("Name", "李四");
ht.put("Age", "35");
st.setAttribute("KeyList", ht);
System.out.print(st.toString());
}
2 自定义集合替换
public static void fun2() {
StringTemplate st = new StringTemplate(
"自定义集合替换 $List:{姓名:$it.Name$ 年龄:$it.Age$}$");
st.setAttribute("List.{Name,Age}", "王二", "29");
System.out.print(st.toString());

}
3 对象变量替换
定义类
private static class User {
String name;
String age;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAge() {
return age;
}

public void setAge(String age) {
this.age = age;
}
}
public static void fun3() {
User us = new User();
us.name = "张三";
us.age = "23";
List<User> uss = new ArrayList<User>();
uss.add(us);
uss.add(us);
uss.add(us);
uss.add(us);
uss.add(us);
StringTemplate st = new StringTemplate(
"<table>$Item:{<tr class=black><td>$it.name$</td></tr>},{<tr class=red><td>$it.age$</td></tr>};separator=/"/n/"$</table>");
st.setAttribute("Item", uss);
System.out.print(st.toString());
}
交叉替换
public static void fun4() {
User us = new User();
us.name = "张三";
us.age = "23";
List<User> uss = new ArrayList<User>();
uss.add(us);
uss.add(us);
uss.add(us);
uss.add(us);
uss.add(us);

StringTemplateGroup sg = new StringTemplateGroup("GroupTest");
sg.defineTemplate("RowRed",
"<tr class=red><td>$it.Name$</td><td>$it.Age$</td></tr>/n");
sg.defineTemplate("Rowblack",
"<tr class=black><td>$it.Name$</td><td>$it.Age$</td></tr>/n");
StringTemplate st = sg.defineTemplate("List",
"<table>$Item:RowRed(),Rowblack()$</table>");
st.setAttribute("Item", uss);
System.out.print(st.toString());
}
4 条件判断
public static void fun5() {
StringTemplate st = new StringTemplate(
"当前用户登陆状态: $if(IsAdmin)$ 用户登陆成功! $else$ 用户没有登陆! $endif$");
st.setAttribute("IsAdmin", true);
System.out.print(st.toString());
}
5 sql语句实现
theQuery.st内容
SELECT $column; separator=","$ FROM $table$;
public static void fun6() {
// 一个sql语句的实现
StringTemplateGroup group = new StringTemplateGroup("myGroup", "c:/");
StringTemplate query = group.getInstanceOf("theQuery");
query.setAttribute("column", "name");
query.setAttribute("column", "email");
query.setAttribute("table", "User");
System.out.print(query.toString());
}
6 使用AttributeRenderer
private static class DateRenderer implements AttributeRenderer {
public String toString(Object o) {
SimpleDateFormat f = new SimpleDateFormat("yyyy.MM.dd");
return f.format(((Calendar) o).getTime());
}
}
public static void fun7() {
StringTemplate st = new StringTemplate("date: <created>",
AngleBracketTemplateLexer.class);
st.setAttribute("created", new GregorianCalendar(2005, 07 - 1, 05));
st.registerRenderer(GregorianCalendar.class, new DateRenderer());

String result = st.toString();

System.out.print(result.toString());
}