Freemarker通过模板字符串或模板文件生成数据

约定不等于承诺〃 2021-09-23 07:38 430阅读 0赞

1. 模板字符串

@Test
    public void test() throws Exception {
    	Map<String, String> map = new HashMap<String, String>();
    	map.put("username", "lisi");
    	String templateString = "欢迎${username}登录！";
    	StringWriter result = new StringWriter();
    	Template t = new Template("template", new StringReader(templateString), new Configuration(Configuration.VERSION_2_3_23));
    	t.process(map, result);
    	System.out.println(result.toString());
    }

2.模板文件

比如：有一个echarts的option模板（option.ftl）

{
    	title: {
    		text: 'ECharts示例'
    	},
    	tooltip: {
    
    	},
    	legend: {
    		data: ['销量']
    	},
    	xAxis: {
    		data: ${xAxisData}
    	},
    	yAxis: {
    
    	},
    	series: [{
    		name: '销量',
    		type: 'bar',
    		data: ${seriesData}
    	}]
    }

数据：xAxisData为\["衬衫","羊毛衫","雪纺衫","裤子","鞋子","袜子"\]，seriesData为\[5,20,36,10,10,20\]

生成结果为：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA5OTk4MDk_size_16_color_FFFFFF_t_70][]

代码如下：

@Test
    public void test2() throws Exception {
    	// 设置Configuration
    	Configuration configuration = new Configuration(Configuration.VERSION_2_3_23);
    	configuration.setDefaultEncoding("UTF-8");
    	// 根据classloader加载模板文件
    	configuration.setClassLoaderForTemplateLoading(ClassLoader.getSystemClassLoader(), "/");
    
    	// 生成模板对象
    	String templateFileName = "option.ftl";
    	Template template = configuration.getTemplate(templateFileName);
    	StringWriter stringWriter = new StringWriter();
    
    	Map<String, Object> map = new HashMap<String, Object>();
        // 一般开发用List<String>，List<Integer>会多一些，这里为了简单，直接就用数组了
    	String[] xAxisData = new String[]{"衬衫", "羊毛衫", "雪纺衫",
    			"裤子", "鞋子","袜子"};
    	map.put("xAxisData", JSON.toJSONString(xAxisData));
    	int[] seriesData = new int[]{5, 20, 36, 10, 10, 20};
    	map.put("seriesData", JSON.toJSONString(seriesData));
    
    	template.process(map, stringWriter);
    	System.out.println(stringWriter.getBuffer().toString());
    }

项目目录结构如图：

![20190912214737369.png][]

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.kittycoder</groupId>
        <artifactId>FreemarkerDemo</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <junit.version>4.12</junit.version>
            <freemarker.version>2.3.23</freemarker.version>
            <fastjson.version>1.2.21</fastjson.version>
        </properties>
    
        <dependencies>
            
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
                <scope>test</scope>
            </dependency>
            
            <dependency>
                <groupId>org.freemarker</groupId>
                <artifactId>freemarker</artifactId>
                <version>${freemarker.version}</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>
        </dependencies>
    </project>

参考链接：

[https://freemarker.apache.org/docs/pgui\_quickstart\_all.html][https_freemarker.apache.org_docs_pgui_quickstart_all.html]

[http://www.028888.net/archives/2016\_05\_1016.html][http_www.028888.net_archives_2016_05_1016.html]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA5OTk4MDk_size_16_color_FFFFFF_t_70]: /images/20210923/05f06d06cdc641b282c83de4286cd425.png
[20190912214737369.png]: /images/20210923/eb73340ae30f40ad92b25c8ac5af1b09.png
[https_freemarker.apache.org_docs_pgui_quickstart_all.html]: https://freemarker.apache.org/docs/pgui_quickstart_all.html
[http_www.028888.net_archives_2016_05_1016.html]: http://www.028888.net/archives/2016_05_1016.html