Spring中XML编组中的强制转义特殊字符-Java问题

Force escaping Special character in XML Marshalling in Spring(Spring中XML编组中的强制转义特殊字符)

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问题描述

我想在使用 Spring Marshaller 时强制转义特殊字符.当我使用 javax.xml.bind.Marshaller

I want to force escaping special characters when I use Spring Marshaller. Below code is perfectly working when I use javax.xml.bind.Marshaller

图书课

package com.odr.core.action;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "book")
public class Book {

    private String name;
    private String author;
    private String publisher;
    private String isbn;

    @XmlJavaTypeAdapter(value=CDATAAdapter.class)
    private String description;

    public String getName() {
        return name;
    }

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

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public String getIsbn() {
        return isbn;
    }

    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @Override
    public String toString() {
        return "Book [name=" + name + ", author=" + author + ", publisher="
            + publisher + ", isbn=" + isbn + ", description=" + description
            + "]";
    }   
}

对象到 XML

        writer = new BufferedWriter(new FileWriter(selectedFile));
        context = JAXBContext.newInstance(Book.class);
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        m.setProperty("com.sun.xml.bind.marshaller.CharacterEscapeHandler",
                new CharacterEscapeHandler() {
                    @Override
                    public void escape(char[] ch, int start, int length,
                            boolean isAttVal, Writer writer)
                            throws IOException {
                        writer.write(ch, start, length);
                    }
                });
        m.marshal(book, writer);

输出:

<description>

<![CDATA[<p>With hundreds of practice questions and hands-on exercises, <b>SCJP Sun Certified Programmer for Java 6 Study Guide</b> covers what you need to know--and shows you how to prepare--for this challenging exam. </p>]]>
</description>

但是当我使用 org.springframework.oxm.jaxb.Jaxb2Marshaller 时，同样的代码不起作用，下面是代码

But same kind of code is not working when I use org.springframework.oxm.jaxb.Jaxb2Marshaller, Below is the code

    Jaxb2Marshaller jaxb2Marshaller = new Jaxb2Marshaller();
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("jaxb.formatted.output", true);
    jaxb2Marshaller.setPackagesToScan("com.odr.core.action");
    // com.sun.xml.bind.characterEscapeHandler
    // com.sun.xml.bind.marshaller.CharacterEscapeHandler
    map.put("com.sun.xml.bind.marshaller.CharacterEscapeHandler",
            new CharacterEscapeHandler() {
                @Override
                public void escape(char[] ac, int i, int j, boolean flag,
                        Writer writer) throws IOException {
                    writer.write(ac, i, j);
                }
            });
    jaxb2Marshaller.setMarshallerProperties(map);

    org.springframework.oxm.Marshaller marshaller = jaxb2Marshaller;
    FileOutputStream fos = null;
    // String fileNamePath = directory.getAbsolutePath() + "\" + fileName;

    try {
        // fos = new FileOutputStream(fileNamePath);
        fos = new FileOutputStream(selectedFile);
        marshaller.marshal(book, new StreamResult(fos));

        // File f = new File(directory,fileName);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (fos != null) {
            fos.close();
        }
    }

输出

<description>&lt;![CDATA[&lt;p&gt;With hundreds of practice questions and hands-on exercises, &lt;b&gt;SCJP Sun Certified Programmer for Java 6 Study Guide&lt;/b&gt; covers what you need to know--and shows you how to prepare--for this challenging exam. &lt;/p&gt;]]&gt;</description>

第一个片段没有对特殊字符进行编码.但是，虽然我设置了属性，但使用 Spring 的第二个片段确实进行了编码.为了不影响现有代码，我必须在我的项目中使用 Spring.有什么办法可以解决吗

The first snippet didn't encode the special characters. But the second snippet which is using Spring did encode though I set property. I have to use Spring in my project for not affecting existing code. Is there any way I can fix it

推荐答案

好的，我也遇到了同样的问题，就这样解决了.

Ok, I had the same problem, and I solved it this way.

首先要做的事情.您应该创建两个 bean.一个用于 Jaxb2Marshaller，另一个用于 MarshallingHttpMessageConverter.我假设你想保留你的配置，所以我将使用你的代码.

First things first. You should create two beans. One for the Jaxb2Marshaller and another MarshallingHttpMessageConverter. I'm supposing that you want to keep your configuration, so I'm going to use your code.

创建 Jaxb2Marshaller bean:

@Bean
public Jaxb2Marshaller getJaxb2Marshaller() {
    Jaxb2Marshaller jaxb2Marshaller = new Jaxb2Marshaller();
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("jaxb.formatted.output", true);
    jaxb2Marshaller.setPackagesToScan("com.odr.core.action");
    map.put("com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler",
            new CharacterEscapeHandler() {
                @Override
                public void escape(char[] ac, int i, int j, boolean flag,
                                   Writer writer) throws IOException {
                    writer.write(ac, i, j);
                }
            });
    jaxb2Marshaller.setMarshallerProperties(map);

    org.springframework.oxm.Marshaller marshaller = jaxb2Marshaller;
    FileOutputStream fos = null;

    try {
        fos = new FileOutputStream(selectedFile);
        marshaller.marshal(book, new StreamResult(fos));
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (fos != null) {
            fos.close();
        }
    }

    return jaxb2Marshaller;
}

好吧，我使用的是 Java 8，所以我将 com.sun.xml.bind.marshaller.CharacterEscapeHandler 更改为 com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler 如上所示.

Well, I'm using Java 8 so I changed com.sun.xml.bind.marshaller.CharacterEscapeHandler to com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler as you can see above.

创建 MarshallingHttpMessageConverter bean:

@Bean
public MarshallingHttpMessageConverter getMarshallingHttpMessageConverter() {
    return new MarshallingHttpMessageConverter(getJaxb2Marshaller());
}

您必须注意到我创建了自己的 HttpMessageConverter 来解决问题.这是因为 Spring 使用它自己的转换器，每次需要将实体或 DTO 转换为 XML 对象时，它都会创建一个新的 Marshaller 实例.所以，我认为下面的代码将解决您的问题.希望对你有帮助.

You must notice that I've created my own HttpMessageConverter to solve the problem. That's because Spring uses it's own converter that creates a new Marshaller instance everytime it needs to convert a entity or a DTO to XML objetct. So, I think the code below will solve your problem. Hope it helps you.

import com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.xml.MarshallingHttpMessageConverter;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;

@Configuration
public class XmlParseConfig {
    @Bean
    public Jaxb2Marshaller getJaxb2Marshaller() {
        Jaxb2Marshaller jaxb2Marshaller = new Jaxb2Marshaller();
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("jaxb.formatted.output", true);
        jaxb2Marshaller.setPackagesToScan("com.odr.core.action");
        map.put("com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler",
                new CharacterEscapeHandler() {
                    @Override
                    public void escape(char[] ac, int i, int j, boolean flag,
                                       Writer writer) throws IOException {
                        writer.write(ac, i, j);
                    }
                });
        jaxb2Marshaller.setMarshallerProperties(map);

        org.springframework.oxm.Marshaller marshaller = jaxb2Marshaller;
        FileOutputStream fos = null;

        try {
            fos = new FileOutputStream(selectedFile);
            marshaller.marshal(book, new StreamResult(fos));
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                fos.close();
            }
        }

        return jaxb2Marshaller;
    }

    @Bean
    public MarshallingHttpMessageConverter getMarshallingHttpMessageConverter() {
        return new MarshallingHttpMessageConverter(getJaxb2Marshaller());
    }
}

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