什么是Freemarker?
FreeMarker是一个用Java语言编写的模板引擎，它基于模板来生成文本输出。FreeMarker与Web容器无关，即在Web运行时，它并不知道Servlet或HTTP。它不仅可以用作表现层的实现技术，而且还可以用于生成XML，JSP或Java 等。
目前企业中:主要用Freemarker做静态页面或是页面展示
FreeMarker是一个用Java语言编写的模板引擎，它基于模板来生成文本输出。FreeMarker与Web容器无关，即在Web运行时，它并不知道Servlet或HTTP。它不仅可以用作表现层的实现技术，而且还可以用于生成XML，JSP或Java 等。
目前企业中:主要用Freemarker做静态页面或是页面展示
一.工程结构
二.web.xml
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[/url]
[/url]1
<?
xml version="1.0" encoding="UTF-8"
?>
2
<
web-app
version
="2.4"
xmlns
="http://java.sun.com/xml/ns/j2ee"
3
xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
4
xsi:schemaLocation
="http://java.sun.com/xml/ns/j2ee
5
>
6
7
<
display-name
>
SpringMVC</
display-name
>
8
9
<
context-param
>
10
<
param-name
>
contextConfigLocation</
param-name
>
11
<
param-value
>
/WEB-INF/springMVC-servlet.xml</
param-value
>
12
</
context-param
>
13
14
<
listener
>
15
<
listener-class
>
org.springframework.web.context.ContextLoaderListener</
listener-class
>
16
</
listener
>
17
18
<
filter
>
19
<
filter-name
>
encodingFilter</
filter-name
>
20
<
filter-class
>
org.springframework.web.filter.CharacterEncodingFilter</
filter-class
>
21
<
init-param
>
22
<
param-name
>
encoding</
param-name
>
23
<
param-value
>
UTF-8</
param-value
>
24
</
init-param
>
25
<
init-param
>
26
<
param-name
>
forceEncoding</
param-name
>
27
<
param-value
>
true</
param-value
>
28
</
init-param
>
29
</
filter
>
30
<
filter-mapping
>
31
<
filter-name
>
encodingFilter</
filter-name
>
32
<
url-pattern
>
/*</
url-pattern
>
33
</
filter-mapping
>
34
35
<
servlet
>
36
<
servlet-name
>
springMVC</
servlet-name
>
37
<
servlet-class
>
org.springframework.web.servlet.DispatcherServlet</
servlet-class
>
38
<
load-on-startup
>
1</
load-on-startup
>
39
</
servlet
>
40
<
servlet-mapping
>
41
<
servlet-name
>
springMVC</
servlet-name
>
42
<
url-pattern
>
/</
url-pattern
>
43
</
servlet-mapping
>
44
</
web-app
>
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[/url]三.springMVC-servlet.xml
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[/url]1
<?
xml version="1.0" encoding="UTF-8"
?>
2
<
beans
xmlns
="http://www.springframework.org/schema/beans"
3
xmlns:context
="http://www.springframework.org/schema/context"
xmlns:p
="http://www.springframework.org/schema/p"
4
xmlns:mvc
="http://www.springframework.org/schema/mvc"
xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
5
xsi:schemaLocation
="http://www.springframework.org/schema/beans
6
7
8
9
10
11
"
>
12
<!--
自动扫描包
-->
13
<
context:component-scan
base-package
="com.bijian.study.controller"
></
context:component-scan
>
14
15
<!--
默认注解映射支持
-->
16
<
mvc:annotation-driven
></
mvc:annotation-driven
>
17
18
<!--
JSP视图解析器
-->
19
<
bean
id
="viewResolverJsp"
class
="org.springframework.web.servlet.view.InternalResourceViewResolver"
>
20
<
property
name
="prefix"
value
="/WEB-INF/views/"
/>
21
<
property
name
="suffix"
value
=".jsp"
/>
22
<
property
name
="viewClass"
value
="org.springframework.web.servlet.view.InternalResourceView"
/>
23
<
property
name
="order"
value
="1"
/>
24
</
bean
>
25
26
<!--
配置freeMarker视图解析器
-->
27
<
bean
id
="viewResolverFtl"
class
="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"
>
28
<
property
name
="viewClass"
value
="org.springframework.web.servlet.view.freemarker.FreeMarkerView"
/>
29
<
property
name
="contentType"
value
="text/html; charset=UTF-8"
/>
30
<
property
name
="exposeRequestAttributes"
value
="true"
/>
31
<
property
name
="exposeSessionAttributes"
value
="true"
/>
32
<
property
name
="exposeSpringMacroHelpers"
value
="true"
/>
33
<
property
name
="cache"
value
="true"
/>
34
<
property
name
="suffix"
value
=".ftl"
/>
35
<
property
name
="order"
value
="0"
/>
36
</
bean
>
37
38
<!--
配置freeMarker的模板路径
-->
39
<
bean
id
="freemarkerConfig"
class
="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"
>
40
<
property
name
="templateLoaderPath"
value
="/WEB-INF/ftl/"
/>
41
<
property
name
="freemarkerVariables"
>
42
<
map
>
43
<
entry
key
="xml_escape"
value-ref
="fmXmlEscape"
/>
44
</
map
>
45
</
property
>
46
<
property
name
="defaultEncoding"
value
="UTF-8"
/>
47
<
property
name
="freemarkerSettings"
>
48
<
props
>
49
<
prop
key
="template_update_delay"
>
3600</
prop
>
50
<
prop
key
="locale"
>
zh_CN</
prop
>
51
<
prop
key
="datetime_format"
>
yyyy-MM-dd HH:mm:ss</
prop
>
52
<
prop
key
="date_format"
>
yyyy-MM-dd</
prop
>
53
<
prop
key
="number_format"
>
#.##</
prop
>
54
</
props
>
55
</
property
>
56
</
bean
>
57
58
<
bean
id
="fmXmlEscape"
class
="freemarker.template.utility.XmlEscape"
/>
59
</
beans
>
[url=][/url]
[/url] 在JSP和Freemarker的配置项中都有一个order property，上面例子是把freemarker的order设置为0，jsp为1，意思是找view时，先找ftl文件，再找jsp文件做为视图。这样Freemarker视图解析器就能与JSP视图解析器并存。
四.FreeMarkerController.java
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[/url]1
package
com.bijian.study.controller;
2
3
import
java.util.ArrayList;
4
import
java.util.HashMap;
5
import
java.util.List;
6
import
java.util.Map;
7
8
import
javax.servlet.http.HttpServletRequest;
9
import
javax.servlet.http.HttpServletResponse;
10
11
import
org.springframework.stereotype.Controller;
12
import
org.springframework.web.bind.annotation.RequestMapping;
13
import
org.springframework.web.servlet.ModelAndView;
14
15
import
com.alibaba.fastjson.JSON;
16
import
com.bijian.study.utils.JsonUtil;
17
import
com.bijian.study.vo.User;
18
19
@Controller
20
public
class
FreeMarkerController {
21
22
@RequestMapping("/get/usersInfo")
23
public
ModelAndView Add(HttpServletRequest request, HttpServletResponse response) {
24
25
User user = new
User();
26
user.setUsername("zhangsan");
27
user.setPassword("1234");
28
29
User user2 = new
User();
30
user2.setUsername("lisi");
31
user2.setPassword("123");
32
33
List<User> users = new
ArrayList<User>();
34
users.add(user);
35
users.add(user2);
36
return
new
ModelAndView("usersInfo", "users", users);
37
}
38
39
@RequestMapping("/get/allUsers")
40
public
ModelAndView test(HttpServletRequest request, HttpServletResponse response) {
41
42
List<User> users = new
ArrayList<User>();
43
User u1 = new
User();
44
u1.setUsername("王五");
45
u1.setPassword("123");
46
users.add(u1);
47
48
User u2 = new
User();
49
u2.setUsername("张三");
50
u2.setPassword("2345");
51
users.add(u2);
52
53
User u3 = new
User();
54
u3.setPassword("fgh");
55
u3.setUsername("李四");
56
users.add(u3);
57
58
Map<String, Object> rootMap = new
HashMap<String, Object>();
59
rootMap.put("userList", users);
60
Map<String, String> product = new
HashMap<String, String>();
61
rootMap.put("lastProduct", product);
62
product.put("url", "http://www.baidu.com");
63
product.put("name", "green hose");
64
65
String result =JSON.toJSONString(rootMap);
66
67
Map<String, Object> resultMap = new
HashMap<String, Object>();
68
resultMap = JsonUtil.getMapFromJson(result);
69
70
return
new
ModelAndView("allUsers", "resultMap", resultMap);
71
}
72
} [url=][/url]
[/url]五.JsonUtil.java
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[/url]1
package
com.bijian.study.utils;
2
3
import
java.util.Map;
4
5
import
com.alibaba.fastjson.JSON;
6
7
public
class
JsonUtil {
8
9
public
static
Map<String, Object> getMapFromJson(String jsonString) {
10
if
(checkStringIsEmpty(jsonString)) {
11
return
null
;
12
}
13
return
JSON.parseObject(jsonString);
14
}
15
16
/**
17
* 检查字符串是否为空
18
*
@param
str
19
*
@return
20
*/
21
private
static
boolean
checkStringIsEmpty(String str) {
22
if
(str == null
|| str.trim().equals("") || str.equalsIgnoreCase("null")) {
23
return
true
;
24
}
25
return
false
;
26
}
27
} [url=][/url]
[/url]六.User.java
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[/url]1
ackage com.bijian.study.vo;
2
3
public
class
User {
4
5
private
String username;
6
private
String password;
7
8
public
String getUsername() {
9
return
username;
10
}
11
12
public
void
setUsername(String username) {
13
this
.username = username;
14
}
15
16
public
String getPassword() {
17
return
password;
18
}
19
20
public
void
setPassword(String password) {
21
this
.password = password;
22
}
23
} [url=][/url]
[/url]七.usersInfo.ftl
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[/url]1
<!
DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"
>
2
<
html
>
3
<
head
>
4
<
meta
http-equiv
="Content-Type"
content
="text/html; charset=UTF-8"
>
5
<
title
>
usersInfo</
title
>
6
</
head
>
7
<
body
>
8
<
#list
users as user
>
9
<
div
>
10
username : ${user.username},
11
password : ${user.password}
12
</
div
>
13
</
#list
>
14
</
body
>
15
</
html
>
[url=][/url]
[/url]八.allUsers.ftl
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[/url]1
<
html
>
2
<
head
>
3
<
title
>
allUsers</
title
>
4
</
head
>
5
<
body
>
6
<
#list
resultMap.userList as user
>
7
Welcome ${user.username}!<
br
/>
8
</
#list
>
9
<
p
>
Our latest product:
10
<
a
href
="${resultMap.lastProduct.url}"
>
${resultMap.lastProduct.name} </
a
>
!
11
</
body
>
12
</
html
>
[url=][/url]
[/url]九.运行效果
再输入http://localhost:8088/SpringMVC/greeting?name=zhangshan，JSP视图解析器运行依然正常。
至此,就结束完成整合了!
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